# User:Guy vandegrift/Quizbank/Archive1/College Physics/II FEstudy

## TrigPhysFE_151021_Study[edit]

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- This document contains either a study guide OR pairs of exams taken from the same exam bank
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**Attribution**for the quizzes identifies where the questions were obtained**Study guide**links reading materials and/or relevant equations.

### TrigPhysFE_151021_Study-v1s1[edit]

1. These two pulses will collide and produce

- ___ a) negative interference

- ___ b) positive interference

- ___ c) positive diffraction

- ___ d) negative diffraction

2. These two pulses will collide and produce

- ___ a) negative diffraction

- ___ b) negative interference

- ___ c) positive diffraction

- ___ d) positive interference

3. These two pulses will collide and produce

- ___ a) positive interference

- ___ b) negative diffraction

- ___ c) positive diffraction

- ___ d) negative interference

7. Why don't we hear beats when two different notes on a piano are played at the same time?

- ___ a) The note is over by the time the first beat is heard

- ___ b) The beats happen so many times per second you can't hear them.

- ___ c) Echo usually stifles the beats

- ___ d) Reverberation usually stifles the beats

8. A tuning fork with a frequency of 440 Hz is played simultaneously with a tuning fork of 442 Hz. How many beats are heard in 10 seconds?

- ___ a) 20

- ___ b) 40

- ___ c) 30

- ___ d) 50

- ___ e) 60

9. If you start moving towards a source of sound, the pitch becomes

- ___ a) lower

- ___ b) higher

- ___ c) unchanged

10. If a source of sound is moving towards you, the pitch becomes

- ___ a) unchanged

- ___ b) higher

- ___ c) lower

11. Why do rough walls give a concert hall a “fuller” sound, compared to smooth walls?

- ___ a) The difference in path lengths creates more echo.

- ___ b) Rough walls make for a louder sound.

- ___ c) The difference in path lengths creates more reverberation.

12. People don't usually perceive an echo when

- ___ a) it arrives at exactly the same pitch

- ___ b) it takes more than a tenth of a second after the original sound to arrive

- ___ c) it arrives at a higher pitch

- ___ d) it arrives less than a tenth of a second after the original sound

- ___ e) it arrives at a lower pitch

13. A dense rope is connected to a rope with less density (i.e. fewer kilograms per meter). If the rope is stretched and a wave is sent along high density rope,

- ___ a) the low density rope supports a wave with a lower speed

- ___ b) the low density rope supports a wave with a higher speed

- ___ c) the low density rope supports a wave with a lower frequency

- ___ d) the low density rope supports a wave with a higher frequency

14. What happens to the wavelength on a wave on a stretched string if the wave passes from lightweight (low density) region of the rope to a heavy (high density) rope?

- ___ a) the wavelength gets longer

- ___ b) the wavelength stays the same

- ___ c) the wavelength gets shorter

15. When a wave is reflected off a stationary barrier, the reflected wave

- ___ a) has higher frequency than the incident wave

- ___ b) has lower amplitude than the incident wave

- ___ c) both of these are true

16. Comparing a typical church to a professional baseball stadium, the church is likely to have

- ___ a) echo instead of reverberation

- ___ b) both reverberation and echo

- ___ c) neither reverberation nor echo

- ___ d) reverberation instead of echo

17. The temperature is -3 degrees Celsius, and you are standing 0.66 km from a cliff. What is the echo time?

- ___a) 2.949 x 10
^{0}seconds

- ___b) 3.184 x 10
^{0}seconds

- ___c) 3.438 x 10
^{0}seconds

- ___d) 3.713 x 10
^{0}seconds

- ___e) 4.009 x 10
^{0}seconds

18. While standing 0.83 km from a cliff, you measure the echo time to be 4.832 seconds. What is the temperature?

- ___a) 1.57 x 10
^{1}Celsius

- ___b) 1.81 x 10
^{1}Celsius

- ___c) 2.09 x 10
^{1}Celsius

- ___d) 2.42 x 10
^{1}Celsius

- ___e) 2.79 x 10
^{1}Celsius

19. What is the speed of a transverse wave on a string if the string is 1.05 m long, clamped at both ends, and harmonic number 5 has a frequency of 153 Hz?

- ___a) 5.3 x 10
^{1}unit

- ___b) 6.43 x 10
^{1}unit

- ___c) 7.79 x 10
^{1}unit

- ___d) 9.43 x 10
^{1}unit

- ___e) 1.14 x 10
^{2}unit

20. What is the magnitude of the electric field at the origin if a 3 nC charge is placed at x = 5.1 m, and a 2 nC charge is placed at y = 8.6 m?

- ___a) 7.99 x 10
^{-1}N/C

- ___b) 9.22 x 10
^{-1}N/C

- ___c) 1.07 x 10
^{0}N/C

- ___d) 1.23 x 10
^{0}N/C

- ___e) 1.42 x 10
^{0}N/C

21. What angle does the electric field at the origin make with the x-axis if a 2 nC charge is placed at x = -8 m, and a 1.4 nC charge is placed at y = -9.3 m?

- ___a) 2.37 x 10
^{1}degrees

- ___b) 2.74 x 10
^{1}degrees

- ___c) 3.16 x 10
^{1}degrees

- ___d) 3.65 x 10
^{1}degrees

- ___e) 4.22 x 10
^{1}degrees

22. A dipole at the origin consists of charge Q placed at x = 0.5a, and charge of -Q placed at x = -0.5a. The absolute value of the x component of the electric field at (x,y) =( 6a, 4a) is βkQ/a^{2}, where β equals

- ___a) 1.33 x 10
^{-3}unit

- ___b) 1.61 x 10
^{-3}unit

- ___c) 1.95 x 10
^{-3}unit

- ___d) 2.37 x 10
^{-3}unit

- ___e) 2.87 x 10
^{-3}unit

23. A dipole at the origin consists of charge Q placed at x = 0.5a, and charge of -Q placed at x = -0.5a. The absolute value of the y component of the electric field at (x,y) =( 1.1a, 1.2a) is βkQ/a^{2}, where β equals

- ___a) 3.47 x 10
^{-1}unit

- ___b) 4.2 x 10
^{-1}unit

- ___c) 5.09 x 10
^{-1}unit

- ___d) 6.17 x 10
^{-1}unit

- ___e) 7.47 x 10
^{-1}unit

24. How fast is a 2952 eV electron moving?

- ___a) 6.4 x 10
^{6}m/s.

- ___b) 9.5 x 10
^{6}m/s.

- ___c) 1.4 x 10
^{7}m/s.

- ___d) 2.1 x 10
^{7}m/s.

- ___e) 3.2 x 10
^{7}m/s.

25. A proton is accellerated (at rest) from a plate held at 775.8 volts to a plate at zero volts. What is the final speed?

- ___a) 7.6 x 10
^{4}m/s.

- ___b) 1.1 x 10
^{5}m/s.

- ___c) 1.7 x 10
^{5}m/s.

- ___d) 2.6 x 10
^{5}m/s.

- ___e) 3.9 x 10
^{5}m/s.

26. What voltage is required accelerate an electron at rest to a speed of 5.5 x 10^{5} m/s?

- ___a) 2.5 x 10
^{-1}volts

- ___b) 3.8 x 10
^{-1}volts

- ___c) 5.7 x 10
^{-1}volts

- ___d) 8.6 x 10
^{-1}volts

- ___e) 1.3 x 10
^{0}volts

27. What voltage is required to stop a proton moving at a speed of 5.2 x 10^{7} m/s?

- ___a) 9.4 x 10
^{6}volts

- ___b) 1.4 x 10
^{7}volts

- ___c) 2.1 x 10
^{7}volts

- ___d) 3.2 x 10
^{7}volts

- ___e) 4.8 x 10
^{7}volts

28. A parallel plate capacitor has both plates with an area of 0.75 m^{2}. The separation between the plates is 1.53mm. Applied to the plates is a potential difference of 5.05 kV. What is the capacitance?

- ___a) 3.28 nF.

- ___b) 3.77 nF.

- ___c) 4.34 nF.

- ___d) 4.99 nF.

- ___e) 5.74 nF.

29. The same parallel plate capacitor, with area 0.55 m^{2}, plate separation 0.53mm, and an applied voltage of 4.25 kV. How much charge is stored?

- ___a) 39.05 μC.

- ___b) 44.91 μC.

- ___c) 51.64 μC.

- ___d) 59.39 μC.

- ___e) 68.3 μC.

30. A 0.8 Farad capacitor is charged with 1.7 Coulombs. What is the value of the electric field if the plates are 0.5 mm apart?

- ___a) 2.43 kV/m.

- ___b) 2.79 kV/m.

- ___c) 3.21 kV/m.

- ___d) 3.7 kV/m.

- ___e) 4.25 kV/m.

31. A 0.8 Farad capacitor charged with 1.7 Coulombs. What is the energy stored in the capacitor if the plates are 0.5 mm apart?

- ___a) 1.81 J.

- ___b) 2.08 J.

- ___c) 2.39 J.

- ___d) 2.75 J.

- ___e) 3.16 J.

32. A 0.5 Farad capacitor charged with 1.3 Coulombs. What is the force between the plates if they are 0.7 mm apart?

- ___a) 1826 N.

- ___b) 2099 N.

- ___c) 2414 N.

- ___d) 2776 N.

- ___e) 3193 N.

33. An ideal 5.2 V voltage source is connected to two resistors in parallel. One is 1.2, and the other is 3.6 . What is the current through the larger resistor?

- ___a) 0.94 mA.

- ___b) 1.08 mA.

- ___c) 1.25 mA.

- ___d) 1.43 mA.

- ___e) 1.65 mA.

34. A 7 ohm resistor is connected in series to a pair of 3.4 ohm resistors that are in parallel. What is the net resistance?

- ___a) 6.6 ohms.

- ___b) 7.6 ohms.

- ___c) 8.7 ohms.

- ___d) 10 ohms.

- ___e) 11.5 ohms.

35. Two 6.2 ohm resistors are connected in parallel. This combination is then connected in series to a 2.6 ohm resistor. What is the net resistance?

- ___a) 3.7 ohms.

- ___b) 4.3 ohms.

- ___c) 5 ohms.

- ___d) 5.7 ohms.

- ___e) 6.6 ohms.

36. An ideal 7.4 volt battery is connected to a 0.074 ohm resistor. To measure the current an ammeter with a resistance of 12 is used. What current does the ammeter actually read?

- ___a) 49.2 A.

- ___b) 56.6 A.

- ___c) 65.1 A.

- ___d) 74.8 A.

- ___e) 86 A.

37. A battery has an emf of 5.3 volts, and an internal resistance of 428 . It is connected to a 2.3 resistor. What power is developed in the 2.3 resistor?

- ___a) 4.96 W.

- ___b) 5.71 W.

- ___c) 6.56 W.

- ___d) 7.55 W.

- ___e) 8.68 W.

38. A cosmic ray alpha particle encounters Earth's magnetic field at right angles to a field of 7.4 μT. The kinetic energy is 437 keV. What is the radius of particle's orbit?

- ___a) 1.3 x 10
^{2}m.

- ___b) 4.1 x 10
^{2}m.

- ___c) 1.3 x 10
^{3}m.

- ___d) 4.1 x 10
^{3}m.

- ___e) 1.3 x 10
^{4}m.

39. Two parallel wires are 7.5 meters long, and are separated by 4.4 mm. What is the force if both wires carry a current of 14.8 amps?

- ___a) 2.36 x 10
^{-3}newtons

- ___b) 7.47 x 10
^{-3}newtons

- ___c) 2.36 x 10
^{-2}newtons

- ___d) 7.47 x 10
^{-2}newtons

- ___e) 2.36 x 10
^{-1}newtons

40. Blood is flowing at an average rate of 21.5 cm/s in an artery that has an inner diameter of 3.5 mm. What is the voltage across a hall probe placed across the inner diameter of the artery if the perpendicular magnetic field is 0.11 Tesla?

- ___a) 8.28 x 10
^{-6}Volts

- ___b) 2.62 x 10
^{-5}Volts

- ___c) 8.28 x 10
^{-5}Volts

- ___d) 2.62 x 10
^{-4}Volts

- ___e) 8.28 x 10
^{-4}Volts

41. An electron tube on Earth's surface is oriented horizontally towards magnetic north. The electron is traveling at 0.06c, and Earth's magnetic field makes an angle of 48.5 degrees with respect to the horizontal. To counter the magnetic force, a voltage is applied between two large parallel plates that are 59 mm apart. What must be the applied voltage if the magnetic field is 45μT?

- ___a) 1.1 x 10
^{0}volts

- ___b) 3.6 x 10
^{0}volts

- ___c) 1.1 x 10
^{1}volts

- ___d) 3.6 x 10
^{1}volts

- ___e) 1.1 x 10
^{2}volts

43. If this represents the eye looking at an object, where is this object?

- ___ a) very far away

- ___ b) at infinity

- ___ c) directly in front of the eye (almost touching)

- ___ d) One focal length in front of the eye

- ___ e) Two (of the other answers) are true

44. After passing through a the lens of a camera or the eye, the focal point is defined as where the rays meet.

- ___ a) true

- ___ b) false

45. Mr. Smith is gazing at something as shown in the figure to the left. Suppose he does not refocus, but attempts to stare at the star shown in the figures below. Which diagram depicts how the rays from the star would travel if he does not refocus?

- ___ a) how a nearsighted person might see an object that is too close for comfort

- ___ b) how a farsighted person might see a distant object

- ___ c) how a nearsighted person might see a distant object

- ___ d) how a farsighted person might see an object that is too close for comfort

- ___ a) how a nearsighted person might see a distant object

- ___ b) how a farsighted person might see an object that is too close for comfort

- ___ c) how a nearsighted person might see an object that is too close for comfort

- ___ d) how a farsighted person might see a distant object

48. In optics, **normal** means

- ___ a) to the left of the optical axis

- ___ b) parallel to the surface

- ___ c) to the right of the optical axis

- ___ d) perpendicular to the surface

49. The law of reflection applies to

- ___ a) only light in a vacuum

- ___ b) both flat and curved surfaces

- ___ c) telescopes but not microscopes

- ___ d) curved surfaces

- ___ e) flat surfaces

50. When light passes from air to glass

- ___ a) it does not bend

- ___ b) the frequency increases

- ___ c) the frequency decreases

- ___ d) it bends towards the normal

- ___ e) it bends away from the normal

51. When light passes from glass to air

- ___ a) the frequency decreases

- ___ b) the frequency increases

- ___ c) it bends away from the normal

- ___ d) it bends towards the normal

- ___ e) it does not bend

52. An important principle that allows fiber optics to work is

- ___ a) partial internal absorption

- ___ b) the invariance of the speed of light

- ___ c) total external refraction

- ___ d) the Doppler shift

- ___ e) total internal reflection

53. The focal point is where

- ___ a) the center of the lens

- ___ b) rays meet whenever they pass through a lens

- ___ c) rays meet whenever they are forming an image

- ___ d) rays meet if they were parallel to the optical axis before striking a lens

- ___ e) rays meet if they are parallel to each other

54. An object is placed 8 cm to the left of a diverging lens with a focal length of 4.3 cm. How far is the image from the lens?

- ___a) 2.8 x 10
^{0}cm

- ___b) 4.97 x 10
^{0}cm

- ___c) 8.84 x 10
^{0}cm

- ___d) 1.57 x 10
^{1}cm

- ___e) 2.8 x 10
^{1}cm

55. An object is placed 4.15 cm to the left of a converging lens with a focal length of 3.6 cm. How far is the image from the lens?

- ___a) 8.59 x 10
^{0}cm

- ___b) 1.53 x 10
^{1}cm

- ___c) 2.72 x 10
^{1}cm

- ___d) 4.83 x 10
^{1}cm

- ___e) 8.59 x 10
^{1}cm

56. An object of height 0.75 cm is placed 147 cm behind a diverging lens with a focal length of 86 cm. What is the height of the image?

- ___a) 2.77 x 10
^{-1}cm

- ___b) 3.32 x 10
^{-1}cm

- ___c) 3.99 x 10
^{-1}cm

- ___d) 4.78 x 10
^{-1}cm

- ___e) 5.74 x 10
^{-1}cm

57. An object is placed 10.9 cm to the left of a diverging lens with a focal length of 16.3 cm. On the side, at a distance of 5.7 cm from the diverging lens is a converging lens with focal length equal to 4 cm. How far is the final image from the converging lens?

- ___a) 1.88 x 10
^{0}cm

- ___b) 5.94 x 10
^{0}cm

- ___c) 1.88 x 10
^{1}cm

- ___d) 5.94 x 10
^{1}cm

- ___e) 1.88 x 10
^{2}cm

58. Excepting cases where where quantum jumps in energy are induced in another object (i.e., using only the uncertainty principle), which would NOT put a classical particle into the quantum regime?

- ___ a) low mass

- ___ b) confinement to a small space

- ___ c) low speed

- ___ d) high speed

59. How does the Bohr atom differ from Newton's theory of planetary orbits?

- ___ a) The force between proton and electron is not attractive for the atom, but it is for planets and the sun.

- ___ b) electrons make elliptical orbits while planets make circular orbits

- ___ c) The force between planets and the sun is not attractive for the atom, but it is for proton and electron.

- ___ d) planets make elliptical orbits while the electron makes circular orbits

60. What are the units of Plank's constant?

- ___ a) momentum x distance

- ___ b) energy x time

- ___ c) all of the above

- ___ d) mass x velocity x distance

- ___ e) none of the above

61. What are the units of Plank's constant?

- ___ a) mass x velocity

- ___ b) all of the above

- ___ c) momentum x distance x mass

- ___ d) none of the above

- ___ e) energy x time

62. How would you describe Old Quantum Theory

- ___ a) self-consistent but not complete

- ___ b) complete and self-consistent

- ___ c) complete but not self-consistent

- ___ d) neither complete nor self-consistent

63. The first paper that introduced quantum mechanics was the study of

- ___ a) light

- ___ b) protons

- ___ c) electrons

- ___ d) energy

64. What are examples of energy?

- ___ a) heat

- ___ b) mgh where m is mass, g is gravity, and h is height

- ___ c) all of the above

- ___ d)

65. What are examples of energy?

- ___ a)

- ___ b) all of the above

- ___ c) heat

- ___ d) momentum

66. What was Plank's understanding of the significance of his work on blackbody radiation?

- ___ a) he knew it would someday win him a Nobel prize

- ___ b) he eventually convinced his dissertation committee that the theory was correct

- ___ c) the thought it was some sort of mathematical trick

- ___ d) he was afraid to publish it for fear of losing his reputation

67. What was "spooky" about Taylor's 1909 experiment with wave interference?

- ___ a) The light was dim, but it didn't matter because he was blind.

- ___ b) The interference pattern mysteriously disappeared.

- ___ c) The light was so dim that the photoelectric effect couldn't occur

- ___ d) The light was so dim that only one photon at a time was near the slits.

68. Approximately how often does a supernovae occur in a typical galaxy?

- ___ a) once a 5 months

- ___ b) once every 5 years

- ___ c) once every 50 years

69. If a star were rushing towards Earth at a high speed

- ___ a) there would be no shift in the spectral lines

- ___ b) there would be a red shift in the spectral lines

- ___ c) there would be a blue shift in the spectral lines

70. An example of a standard candle is

- ___ a) all of these are standard candles

- ___ b) a supernova in a distant galaxy

- ___ c) any part of the nighttime sky that is giving off light

- ___ d) any part of the nighttime sky that is dark

71. If a galaxy that is 10 Mpc away is receding at 700km/s, how far would a galaxy be receding if it were 20 Mpc away?

- ___ a) 350km/s

- ___ b) 700km/s

- ___ c) 1400km/s

72. The "apparent" magnitude of a star is

- ___ a) How bright it is as viewed from Earth

- ___ b) How bright it would be if it were not receding due to Hubble expansion

- ___ c) How bright it would be if you were exactly one light year away

73. In the essay "Why the sky is dark at night", a graph of velocity versus distance is shown. What is odd about those galaxies in the Virgo cluster (circled in the graph)?

- ___ a) they have a wide variety of speeds

- ___ b) they are not receding away from us

- ___ c) the cluster is close to us

- ___ d) they all have nearly the same speed

74. Why was it important to observe supernovae in galaxies that are close to us?

- ___ a) it is easier to measure the doppler shift, and that is not always easy to measure.

- ___ b) because supernovea are impossible to see in distant galaxies

- ___ c) we have other ways of knowing the distances to the nearby galaxies; this gives us the opportunity to study supernovae of known distance and ascertain their absolute magnitude.

- ___ d) they have less of a red-shift, and interstellar gas absorbs red light

75. What if clouds of dust blocked the light from distant stars? Could that allow for an infinite and static universe?

- ___ a) No, there are clouds, but they remain too cold to resolve the paradox

- ___ b) Yes, that is an actively pursued hypothesis

- ___ c) No, if there were clouds, we wouldn't see the distant galaxies

- ___ d) No, the clouds would get hot

#### Key to TrigPhysFE_151021_Study-v1s1[edit]

1. These two pulses will collide and produce

- - a) negative interference

- + b) positive interference

- - c) positive diffraction

- - d) negative diffraction

2. These two pulses will collide and produce

- - a) negative diffraction

- + b) negative interference

- - c) positive diffraction

- - d) positive interference

3. These two pulses will collide and produce

- + a) positive interference

- - b) negative diffraction

- - c) positive diffraction

- - d) negative interference

7. Why don't we hear beats when two different notes on a piano are played at the same time?

- - a) The note is over by the time the first beat is heard

- + b) The beats happen so many times per second you can't hear them.

- - c) Echo usually stifles the beats

- - d) Reverberation usually stifles the beats

8. A tuning fork with a frequency of 440 Hz is played simultaneously with a tuning fork of 442 Hz. How many beats are heard in 10 seconds?

- + a) 20

- - b) 40

- - c) 30

- - d) 50

- - e) 60

9. If you start moving towards a source of sound, the pitch becomes

- - a) lower

- + b) higher

- - c) unchanged

10. If a source of sound is moving towards you, the pitch becomes

- - a) unchanged

- + b) higher

- - c) lower

11. Why do rough walls give a concert hall a “fuller” sound, compared to smooth walls?

- - a) The difference in path lengths creates more echo.

- - b) Rough walls make for a louder sound.

- + c) The difference in path lengths creates more reverberation.

12. People don't usually perceive an echo when

- - a) it arrives at exactly the same pitch

- - b) it takes more than a tenth of a second after the original sound to arrive

- - c) it arrives at a higher pitch

- + d) it arrives less than a tenth of a second after the original sound

- - e) it arrives at a lower pitch

13. A dense rope is connected to a rope with less density (i.e. fewer kilograms per meter). If the rope is stretched and a wave is sent along high density rope,

- - a) the low density rope supports a wave with a lower speed

- + b) the low density rope supports a wave with a higher speed

- - c) the low density rope supports a wave with a lower frequency

- - d) the low density rope supports a wave with a higher frequency

14. What happens to the wavelength on a wave on a stretched string if the wave passes from lightweight (low density) region of the rope to a heavy (high density) rope?

- + a) the wavelength gets longer

- - b) the wavelength stays the same

- - c) the wavelength gets shorter

15. When a wave is reflected off a stationary barrier, the reflected wave

- - a) has higher frequency than the incident wave

- + b) has lower amplitude than the incident wave

- - c) both of these are true

16. Comparing a typical church to a professional baseball stadium, the church is likely to have

- - a) echo instead of reverberation

- - b) both reverberation and echo

- - c) neither reverberation nor echo

- + d) reverberation instead of echo

17. The temperature is -3 degrees Celsius, and you are standing 0.66 km from a cliff. What is the echo time?

- -a) 2.949 x 10
^{0}seconds

- -a) 2.949 x 10

- -b) 3.184 x 10
^{0}seconds

- -b) 3.184 x 10

- -c) 3.438 x 10
^{0}seconds

- -c) 3.438 x 10

- -d) 3.713 x 10
^{0}seconds

- -d) 3.713 x 10

- +e) 4.009 x 10
^{0}seconds

- +e) 4.009 x 10

18. While standing 0.83 km from a cliff, you measure the echo time to be 4.832 seconds. What is the temperature?

- -a) 1.57 x 10
^{1}Celsius

- -a) 1.57 x 10

- -b) 1.81 x 10
^{1}Celsius

- -b) 1.81 x 10

- +c) 2.09 x 10
^{1}Celsius

- +c) 2.09 x 10

- -d) 2.42 x 10
^{1}Celsius

- -d) 2.42 x 10

- -e) 2.79 x 10
^{1}Celsius

- -e) 2.79 x 10

19. What is the speed of a transverse wave on a string if the string is 1.05 m long, clamped at both ends, and harmonic number 5 has a frequency of 153 Hz?

- -a) 5.3 x 10
^{1}unit

- -a) 5.3 x 10

- +b) 6.43 x 10
^{1}unit

- +b) 6.43 x 10

- -c) 7.79 x 10
^{1}unit

- -c) 7.79 x 10

- -d) 9.43 x 10
^{1}unit

- -d) 9.43 x 10

- -e) 1.14 x 10
^{2}unit

- -e) 1.14 x 10

20. What is the magnitude of the electric field at the origin if a 3 nC charge is placed at x = 5.1 m, and a 2 nC charge is placed at y = 8.6 m?

- -a) 7.99 x 10
^{-1}N/C

- -a) 7.99 x 10

- -b) 9.22 x 10
^{-1}N/C

- -b) 9.22 x 10

- +c) 1.07 x 10
^{0}N/C

- +c) 1.07 x 10

- -d) 1.23 x 10
^{0}N/C

- -d) 1.23 x 10

- -e) 1.42 x 10
^{0}N/C

- -e) 1.42 x 10

21. What angle does the electric field at the origin make with the x-axis if a 2 nC charge is placed at x = -8 m, and a 1.4 nC charge is placed at y = -9.3 m?

- -a) 2.37 x 10
^{1}degrees

- -a) 2.37 x 10

- +b) 2.74 x 10
^{1}degrees

- +b) 2.74 x 10

- -c) 3.16 x 10
^{1}degrees

- -c) 3.16 x 10

- -d) 3.65 x 10
^{1}degrees

- -d) 3.65 x 10

- -e) 4.22 x 10
^{1}degrees

- -e) 4.22 x 10

22. A dipole at the origin consists of charge Q placed at x = 0.5a, and charge of -Q placed at x = -0.5a. The absolute value of the x component of the electric field at (x,y) =( 6a, 4a) is βkQ/a^{2}, where β equals

- -a) 1.33 x 10
^{-3}unit

- -a) 1.33 x 10

- -b) 1.61 x 10
^{-3}unit

- -b) 1.61 x 10

- -c) 1.95 x 10
^{-3}unit

- -c) 1.95 x 10

- -d) 2.37 x 10
^{-3}unit

- -d) 2.37 x 10

- +e) 2.87 x 10
^{-3}unit

- +e) 2.87 x 10

23. A dipole at the origin consists of charge Q placed at x = 0.5a, and charge of -Q placed at x = -0.5a. The absolute value of the y component of the electric field at (x,y) =( 1.1a, 1.2a) is βkQ/a^{2}, where β equals

- +a) 3.47 x 10
^{-1}unit

- +a) 3.47 x 10

- -b) 4.2 x 10
^{-1}unit

- -b) 4.2 x 10

- -c) 5.09 x 10
^{-1}unit

- -c) 5.09 x 10

- -d) 6.17 x 10
^{-1}unit

- -d) 6.17 x 10

- -e) 7.47 x 10
^{-1}unit

- -e) 7.47 x 10

24. How fast is a 2952 eV electron moving?

- -a) 6.4 x 10
^{6}m/s.

- -a) 6.4 x 10

- -b) 9.5 x 10
^{6}m/s.

- -b) 9.5 x 10

- -c) 1.4 x 10
^{7}m/s.

- -c) 1.4 x 10

- -d) 2.1 x 10
^{7}m/s.

- -d) 2.1 x 10

- +e) 3.2 x 10
^{7}m/s.

- +e) 3.2 x 10

25. A proton is accellerated (at rest) from a plate held at 775.8 volts to a plate at zero volts. What is the final speed?

- -a) 7.6 x 10
^{4}m/s.

- -a) 7.6 x 10

- -b) 1.1 x 10
^{5}m/s.

- -b) 1.1 x 10

- -c) 1.7 x 10
^{5}m/s.

- -c) 1.7 x 10

- -d) 2.6 x 10
^{5}m/s.

- -d) 2.6 x 10

- +e) 3.9 x 10
^{5}m/s.

- +e) 3.9 x 10

26. What voltage is required accelerate an electron at rest to a speed of 5.5 x 10^{5} m/s?

- -a) 2.5 x 10
^{-1}volts

- -a) 2.5 x 10

- -b) 3.8 x 10
^{-1}volts

- -b) 3.8 x 10

- -c) 5.7 x 10
^{-1}volts

- -c) 5.7 x 10

- +d) 8.6 x 10
^{-1}volts

- +d) 8.6 x 10

- -e) 1.3 x 10
^{0}volts

- -e) 1.3 x 10

27. What voltage is required to stop a proton moving at a speed of 5.2 x 10^{7} m/s?

- -a) 9.4 x 10
^{6}volts

- -a) 9.4 x 10

- +b) 1.4 x 10
^{7}volts

- +b) 1.4 x 10

- -c) 2.1 x 10
^{7}volts

- -c) 2.1 x 10

- -d) 3.2 x 10
^{7}volts

- -d) 3.2 x 10

- -e) 4.8 x 10
^{7}volts

- -e) 4.8 x 10

28. A parallel plate capacitor has both plates with an area of 0.75 m^{2}. The separation between the plates is 1.53mm. Applied to the plates is a potential difference of 5.05 kV. What is the capacitance?

- -a) 3.28 nF.

- -b) 3.77 nF.

- +c) 4.34 nF.

- -d) 4.99 nF.

- -e) 5.74 nF.

29. The same parallel plate capacitor, with area 0.55 m^{2}, plate separation 0.53mm, and an applied voltage of 4.25 kV. How much charge is stored?

- +a) 39.05 μC.

- -b) 44.91 μC.

- -c) 51.64 μC.

- -d) 59.39 μC.

- -e) 68.3 μC.

30. A 0.8 Farad capacitor is charged with 1.7 Coulombs. What is the value of the electric field if the plates are 0.5 mm apart?

- -a) 2.43 kV/m.

- -b) 2.79 kV/m.

- -c) 3.21 kV/m.

- -d) 3.7 kV/m.

- +e) 4.25 kV/m.

31. A 0.8 Farad capacitor charged with 1.7 Coulombs. What is the energy stored in the capacitor if the plates are 0.5 mm apart?

- +a) 1.81 J.

- -b) 2.08 J.

- -c) 2.39 J.

- -d) 2.75 J.

- -e) 3.16 J.

32. A 0.5 Farad capacitor charged with 1.3 Coulombs. What is the force between the plates if they are 0.7 mm apart?

- -a) 1826 N.

- -b) 2099 N.

- +c) 2414 N.

- -d) 2776 N.

- -e) 3193 N.

33. An ideal 5.2 V voltage source is connected to two resistors in parallel. One is 1.2, and the other is 3.6 . What is the current through the larger resistor?

- -a) 0.94 mA.

- +b) 1.08 mA.

- -c) 1.25 mA.

- -d) 1.43 mA.

- -e) 1.65 mA.

34. A 7 ohm resistor is connected in series to a pair of 3.4 ohm resistors that are in parallel. What is the net resistance?

- -a) 6.6 ohms.

- -b) 7.6 ohms.

- +c) 8.7 ohms.

- -d) 10 ohms.

- -e) 11.5 ohms.

35. Two 6.2 ohm resistors are connected in parallel. This combination is then connected in series to a 2.6 ohm resistor. What is the net resistance?

- -a) 3.7 ohms.

- -b) 4.3 ohms.

- -c) 5 ohms.

- +d) 5.7 ohms.

- -e) 6.6 ohms.

36. An ideal 7.4 volt battery is connected to a 0.074 ohm resistor. To measure the current an ammeter with a resistance of 12 is used. What current does the ammeter actually read?

- -a) 49.2 A.

- -b) 56.6 A.

- -c) 65.1 A.

- -d) 74.8 A.

- +e) 86 A.

37. A battery has an emf of 5.3 volts, and an internal resistance of 428 . It is connected to a 2.3 resistor. What power is developed in the 2.3 resistor?

- -a) 4.96 W.

- -b) 5.71 W.

- -c) 6.56 W.

- -d) 7.55 W.

- +e) 8.68 W.

38. A cosmic ray alpha particle encounters Earth's magnetic field at right angles to a field of 7.4 μT. The kinetic energy is 437 keV. What is the radius of particle's orbit?

- -a) 1.3 x 10
^{2}m.

- -a) 1.3 x 10

- -b) 4.1 x 10
^{2}m.

- -b) 4.1 x 10

- -c) 1.3 x 10
^{3}m.

- -c) 1.3 x 10

- -d) 4.1 x 10
^{3}m.

- -d) 4.1 x 10

- +e) 1.3 x 10
^{4}m.

- +e) 1.3 x 10

39. Two parallel wires are 7.5 meters long, and are separated by 4.4 mm. What is the force if both wires carry a current of 14.8 amps?

- -a) 2.36 x 10
^{-3}newtons

- -a) 2.36 x 10

- -b) 7.47 x 10
^{-3}newtons

- -b) 7.47 x 10

- -c) 2.36 x 10
^{-2}newtons

- -c) 2.36 x 10

- +d) 7.47 x 10
^{-2}newtons

- +d) 7.47 x 10

- -e) 2.36 x 10
^{-1}newtons

- -e) 2.36 x 10

40. Blood is flowing at an average rate of 21.5 cm/s in an artery that has an inner diameter of 3.5 mm. What is the voltage across a hall probe placed across the inner diameter of the artery if the perpendicular magnetic field is 0.11 Tesla?

- -a) 8.28 x 10
^{-6}Volts

- -a) 8.28 x 10

- -b) 2.62 x 10
^{-5}Volts

- -b) 2.62 x 10

- +c) 8.28 x 10
^{-5}Volts

- +c) 8.28 x 10

- -d) 2.62 x 10
^{-4}Volts

- -d) 2.62 x 10

- -e) 8.28 x 10
^{-4}Volts

- -e) 8.28 x 10

41. An electron tube on Earth's surface is oriented horizontally towards magnetic north. The electron is traveling at 0.06c, and Earth's magnetic field makes an angle of 48.5 degrees with respect to the horizontal. To counter the magnetic force, a voltage is applied between two large parallel plates that are 59 mm apart. What must be the applied voltage if the magnetic field is 45μT?

- -a) 1.1 x 10
^{0}volts

- -a) 1.1 x 10

- -b) 3.6 x 10
^{0}volts

- -b) 3.6 x 10

- -c) 1.1 x 10
^{1}volts

- -c) 1.1 x 10

- +d) 3.6 x 10
^{1}volts

- +d) 3.6 x 10

- -e) 1.1 x 10
^{2}volts

- -e) 1.1 x 10

43. If this represents the eye looking at an object, where is this object?

- - a) very far away

- - b) at infinity

- - c) directly in front of the eye (almost touching)

- - d) One focal length in front of the eye

- + e) Two (of the other answers) are true

44. After passing through a the lens of a camera or the eye, the focal point is defined as where the rays meet.

- - a) true

- + b) false

45. Mr. Smith is gazing at something as shown in the figure to the left. Suppose he does not refocus, but attempts to stare at the star shown in the figures below. Which diagram depicts how the rays from the star would travel if he does not refocus?

- - a) how a nearsighted person might see an object that is too close for comfort

- - b) how a farsighted person might see a distant object

- + c) how a nearsighted person might see a distant object

- - d) how a farsighted person might see an object that is too close for comfort

- - a) how a nearsighted person might see a distant object

- + b) how a farsighted person might see an object that is too close for comfort

- - c) how a nearsighted person might see an object that is too close for comfort

- - d) how a farsighted person might see a distant object

48. In optics, **normal** means

- - a) to the left of the optical axis

- - b) parallel to the surface

- - c) to the right of the optical axis

- + d) perpendicular to the surface

49. The law of reflection applies to

- - a) only light in a vacuum

- + b) both flat and curved surfaces

- - c) telescopes but not microscopes

- - d) curved surfaces

- - e) flat surfaces

50. When light passes from air to glass

- - a) it does not bend

- - b) the frequency increases

- - c) the frequency decreases

- + d) it bends towards the normal

- - e) it bends away from the normal

51. When light passes from glass to air

- - a) the frequency decreases

- - b) the frequency increases

- + c) it bends away from the normal

- - d) it bends towards the normal

- - e) it does not bend

52. An important principle that allows fiber optics to work is

- - a) partial internal absorption

- - b) the invariance of the speed of light

- - c) total external refraction

- - d) the Doppler shift

- + e) total internal reflection

53. The focal point is where

- - a) the center of the lens

- - b) rays meet whenever they pass through a lens

- - c) rays meet whenever they are forming an image

- + d) rays meet if they were parallel to the optical axis before striking a lens

- - e) rays meet if they are parallel to each other

54. An object is placed 8 cm to the left of a diverging lens with a focal length of 4.3 cm. How far is the image from the lens?

- +a) 2.8 x 10
^{0}cm

- +a) 2.8 x 10

- -b) 4.97 x 10
^{0}cm

- -b) 4.97 x 10

- -c) 8.84 x 10
^{0}cm

- -c) 8.84 x 10

- -d) 1.57 x 10
^{1}cm

- -d) 1.57 x 10

- -e) 2.8 x 10
^{1}cm

- -e) 2.8 x 10

55. An object is placed 4.15 cm to the left of a converging lens with a focal length of 3.6 cm. How far is the image from the lens?

- -a) 8.59 x 10
^{0}cm

- -a) 8.59 x 10

- -b) 1.53 x 10
^{1}cm

- -b) 1.53 x 10

- +c) 2.72 x 10
^{1}cm

- +c) 2.72 x 10

- -d) 4.83 x 10
^{1}cm

- -d) 4.83 x 10

- -e) 8.59 x 10
^{1}cm

- -e) 8.59 x 10

56. An object of height 0.75 cm is placed 147 cm behind a diverging lens with a focal length of 86 cm. What is the height of the image?

- +a) 2.77 x 10
^{-1}cm

- +a) 2.77 x 10

- -b) 3.32 x 10
^{-1}cm

- -b) 3.32 x 10

- -c) 3.99 x 10
^{-1}cm

- -c) 3.99 x 10

- -d) 4.78 x 10
^{-1}cm

- -d) 4.78 x 10

- -e) 5.74 x 10
^{-1}cm

- -e) 5.74 x 10

57. An object is placed 10.9 cm to the left of a diverging lens with a focal length of 16.3 cm. On the side, at a distance of 5.7 cm from the diverging lens is a converging lens with focal length equal to 4 cm. How far is the final image from the converging lens?

- -a) 1.88 x 10
^{0}cm

- -a) 1.88 x 10

- +b) 5.94 x 10
^{0}cm

- +b) 5.94 x 10

- -c) 1.88 x 10
^{1}cm

- -c) 1.88 x 10

- -d) 5.94 x 10
^{1}cm

- -d) 5.94 x 10

- -e) 1.88 x 10
^{2}cm

- -e) 1.88 x 10

58. Excepting cases where where quantum jumps in energy are induced in another object (i.e., using only the uncertainty principle), which would NOT put a classical particle into the quantum regime?

- - a) low mass

- - b) confinement to a small space

- - c) low speed

- + d) high speed

59. How does the Bohr atom differ from Newton's theory of planetary orbits?

- - a) The force between proton and electron is not attractive for the atom, but it is for planets and the sun.

- - b) electrons make elliptical orbits while planets make circular orbits

- - c) The force between planets and the sun is not attractive for the atom, but it is for proton and electron.

- + d) planets make elliptical orbits while the electron makes circular orbits

60. What are the units of Plank's constant?

- - a) momentum x distance

- - b) energy x time

- + c) all of the above

- - d) mass x velocity x distance

- - e) none of the above

61. What are the units of Plank's constant?

- - a) mass x velocity

- + b) all of the above

- - c) momentum x distance x mass

- - d) none of the above

- - e) energy x time

62. How would you describe Old Quantum Theory

- - a) self-consistent but not complete

- - b) complete and self-consistent

- - c) complete but not self-consistent

- + d) neither complete nor self-consistent

63. The first paper that introduced quantum mechanics was the study of

- + a) light

- - b) protons

- - c) electrons

- - d) energy

64. What are examples of energy?

- - a) heat

- - b) mgh where m is mass, g is gravity, and h is height

- + c) all of the above

- - d)

65. What are examples of energy?

- - a)

- + b) all of the above

- - c) heat

- - d) momentum

66. What was Plank's understanding of the significance of his work on blackbody radiation?

- - a) he knew it would someday win him a Nobel prize

- - b) he eventually convinced his dissertation committee that the theory was correct

- + c) the thought it was some sort of mathematical trick

- - d) he was afraid to publish it for fear of losing his reputation

67. What was "spooky" about Taylor's 1909 experiment with wave interference?

- - a) The light was dim, but it didn't matter because he was blind.

- - b) The interference pattern mysteriously disappeared.

- - c) The light was so dim that the photoelectric effect couldn't occur

- + d) The light was so dim that only one photon at a time was near the slits.

68. Approximately how often does a supernovae occur in a typical galaxy?

- - a) once a 5 months

- - b) once every 5 years

- + c) once every 50 years

69. If a star were rushing towards Earth at a high speed

- - a) there would be no shift in the spectral lines

- - b) there would be a red shift in the spectral lines

- + c) there would be a blue shift in the spectral lines

70. An example of a standard candle is

- - a) all of these are standard candles

- + b) a supernova in a distant galaxy

- - c) any part of the nighttime sky that is giving off light

- - d) any part of the nighttime sky that is dark

71. If a galaxy that is 10 Mpc away is receding at 700km/s, how far would a galaxy be receding if it were 20 Mpc away?

- - a) 350km/s

- - b) 700km/s

- + c) 1400km/s

72. The "apparent" magnitude of a star is

- + a) How bright it is as viewed from Earth

- - b) How bright it would be if it were not receding due to Hubble expansion

- - c) How bright it would be if you were exactly one light year away

73. In the essay "Why the sky is dark at night", a graph of velocity versus distance is shown. What is odd about those galaxies in the Virgo cluster (circled in the graph)?

- + a) they have a wide variety of speeds

- - b) they are not receding away from us

- - c) the cluster is close to us

- - d) they all have nearly the same speed

74. Why was it important to observe supernovae in galaxies that are close to us?

- - a) it is easier to measure the doppler shift, and that is not always easy to measure.

- - b) because supernovea are impossible to see in distant galaxies

- + c) we have other ways of knowing the distances to the nearby galaxies; this gives us the opportunity to study supernovae of known distance and ascertain their absolute magnitude.

- - d) they have less of a red-shift, and interstellar gas absorbs red light

75. What if clouds of dust blocked the light from distant stars? Could that allow for an infinite and static universe?

- - a) No, there are clouds, but they remain too cold to resolve the paradox

- - b) Yes, that is an actively pursued hypothesis

- - c) No, if there were clouds, we wouldn't see the distant galaxies

- + d) No, the clouds would get hot

- Attribution (for quiz questions) under CC-by-SA license

- http://en.wikiversity.org/wiki/How_things_work_college_course/Waves_(Physics_Classroom)
- http://en.wikiversity.org/w/index.php?title=Physics_equations/18-Electric_charge_and_field/Q:findE&oldid=1378605
- http://en.wikiversity.org/w/index.php?title=Physics_equations/21-Circuits,_Bioelectricity,_and_DC_Instruments/Q:circuits&oldid=1391123
- http://en.wikiversity.org/w/index.php?title=Physics_equations/22-Magnetism/Q:forces&oldid=1391166
- http://en.wikiversity.org/w/index.php?title=Physics_equations/25-Geometric_Optics/Q:vision&oldid=1378615

- http://en.wikiversity.org/w/index.php?title=Physics_equations/25-Geometric_Optics/Q:thinLens&oldid=1378617
- http://en.wikiversity.org/w/index.php?title=How_things_work_college_course/Quantum_mechanics_timeline/Quiz&oldid=1396075
- http://en.wikiversity.org/w/index.php?title=Why_is_the_Sky_Dark_at_Night/quiz&oldid=1396006
- Study guide

- http://www.physicsclassroom.com/class/waves
- http://en.wikiversity.org/wiki/Physics_equations/Sheet/All_chapters
- http://en.wikiversity.org/wiki/Physics_equations/Sheet/All_chapters

http://en.wikiversity.org/wiki/Light_and_optics