# Distances/Vectors/Quiz

This plate from Sidney Hall - Urania's Mirror has directions indicated on the upper left side. Credit: Sidney Hall and Adam Cuerden.

Distances/Vectors is a lecture about the application of laboratory physics to astronomical distances. It is a joint offering from the radiation astronomy department and the physics department of the school of physics and astronomy. On the plate from Sidney Hall on Urania's Mirror, directions of North, East, West, and South are indicated.

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## Quiz

1 True or False, A calculation of energy is not possible unless a distance is involved.

 TRUE FALSE

2 Which of the following is not an electron volt?

 the angular momentum of the planet Mercury around the Sun a unit of energy a quantity that denotes the ability to do work 1.2 PeV a unit dimensioned in mass, distance, and time a unit not based on the Coulomb

3 True or False, The force of gravity is a major portion of the strong nuclear force.

 TRUE FALSE

4 Complete the text:

 The tracks in emulsion chambers have been used for measurements of nuclei above in a series of balloon-borne experiments.

5 True or False, The average value of the radius of the Earth's orbit around the Sun is a displacement.

 TRUE FALSE

6 The science of physical and logical laws is called

7 True or False, The temperature of the cores of stars may be determined by the balance between the gravitational attraction and the gas pressure.

 TRUE FALSE

8 The use of the principle of line of sight allows what phenomenon to be determined?

 the Moon is closer to the Earth than the Sun the planet Mercury is nearer to the Earth than Venus any cumulus cloud overhead follows the Sun across the sky the plane of the Earth's orbit around the Sun is in the plane of the galaxy the surface of the photosphere of the Sun is hotter than the surface of Mars lightning always precedes rain

9 True or False, A unit vector is a direction with a magnitude of one.

 TRUE FALSE

10 Which of the following are involved in the weak force?

 a core which emits neutrinos Fermi's β-decay theory 26Al undetectable with balloon-borne detectors Gamow-Teller interactions steady enough emission to be used as a standard for X-ray emission observed with delta-rays in 1731 M. Fierz

11 True or False, Any space in the real universe is completely empty of microwaves.

 TRUE FALSE

12 The strong force is involved in which of the following phenomena?

 s-waves the sum of the spins neutrinos Pauli's exclusion principle deuterium radio waves

13 True or False, When the magnetic poles of the Sun reverse during the solar cycle, there is a short time in which the polar diameter is greater than the equatorial diameter.

 TRUE FALSE

14 Which of the following are associated with electromagnetics?

 angular momentum transfer solar wind protons electrons the baryon neutrino charge neutralization

15 True or False, The generalized weak force theory combines the Fermi and Gamow-Teller conditions into a unified theory.

 TRUE FALSE

16 Which of the following are associated with the big bang neutrinos?

 a launch location relic neutrinos of order of the photon density the thermal energy at which neutrinos decouple neutrinos dynamically dominate baryons a contracting universe

17 True or False, The force of gravity is the first astronomical source of the strong nuclear force.

 TRUE FALSE

18 The generalization to self-gravitating continua is outlined focused on the classification problem of singularities and metamorphoses arising in the

 .

19 If energy is the impetus behind all motion and activity, which of the following are associated with power?

 a launch location a rate of change of the impetus with time photon density an acceleration of the impetus neutrinos dynamically dominating baryons a rate of change of mass

20 Yes or No, North is generally regarded as an upward direction.

 Yes No

21 A first astronomical source has?

 a temporal distribution with at least one datum a spectral distribution a spatial distribution a position or location a geognosy scientific or observational investigations

22

For standard basis, or unit, vectors (i, j, k) and vector components of a (ax, ay, az), what are the right ascension, declination, and value of a?

 if the x-axis is the longitude of the Greenwich meridian, and ax equals ay, then RA equals 6h if the x-axis is the longitude of the Greenwich meridian, and ax equals ay, then RA equals 3h the value of a is given by ${\displaystyle a={\sqrt {a_{x}^{2}+a_{y}^{2}+a_{z}^{2}}}}$ if ax equals ay equals az, then the declination is -45° if ax equals ay equals az, then the declination is +45°

23 Which of the following are characteristic of the first true astrophysical gamma-ray source?

 a strong 2.223 MeV emission line a solar flare the formation of deuterium the electron neutrino OSO-3 neutrons

## Hypotheses

1. More questions aimed at distances and vectors may be better.