Radiation astronomy/Electrons/Quiz

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The composite shows upper atmospheric lightning and electrical discharge phenomena. Credit: Abestrobi.{{free media}}

Electron astronomy is a lecture as part of the astronomy course on the principles of radiation astronomy.

You are free to take this quiz based on electron astronomy at any time.

To improve your score, read and study the lecture, the links contained within, listed under See also, External links, and in the {{principles of radiation astronomy}} template. This should give you adequate background to get 100 %.

As a "learning by doing" resource, this quiz helps you to assess your knowledge and understanding of the information, and it is a quiz you may take over and over as a learning resource to improve your knowledge, understanding, test-taking skills, and your score.

Suggestion: Have the lecture available in a separate window.

To master the information and use only your memory while taking the quiz, try rewriting the information from more familiar points of view, or be creative with association.

Enjoy learning by doing!

Quiz[edit | edit source]


1 True or False, Van Allen radiation belt electrons are constantly removed by collisions with atmospheric neutrals, losses to the magnetopause, and outward radial diffusion.


2 Complete the text:

A composite

spectrum is approximately a

law over at least the ≈ 5 decade wavenumber range 10-13 m-1 < wavenumber < 10-8 m-1 and that may extend to


3 Yes or No, Interstellar scintillation is fluctuations in the amplitude and phase of radio waves caused by scattering in the interstellar medium.


4 When the Earth is viewed from space using X-ray astronomy what characteristic is readily observed?

the magnetic north pole
the Hudson Bay meteorite crater
the South Atlantic Anomaly
the Bermuda Triangle
solar positron events
electrons striking the ionosphere

5 True or False, Electrons in the Earth's magnetosphere are energized by neutral particles from the Sun.


6 Complete the text:

Match up the item letter with each of the possibilities below:
Meteors - A
Cosmic rays - B
Neutrons - C
Protons - D
Electrons - E
Positrons - F
Gamma rays - G
Superluminals - H
X-ray jets

the index of refraction is often greater than 1 just below a resonance frequency

iron, nickel, cobalt, and traces of iridium

Sagittarius X-1

escape from a typical hard low-mass X-ray binary

collisions with argon atoms

X-rays are emitted as they slow down

Henry Moseley using X-ray spectra


7 True or False, Solitary electrons constitute much of the remaining 1 % of cosmic rays.


8 Which of the following is not characteristic of a neutrino?

neutrinos are affected by the weak nuclear force
produced by a positron annihilating an electron
a decay product of a neutron
produced by the near surface fusion on the Sun
may have a mass
comes in mutable varieties

9 True or False, Electron density applied to free radicals is spin density.


10 Which of the following are associated with the IceCube Neutrino Observatory?

under ice
the Amundsen-Scott South Pole Station
Digital Optical Modules
the counting house is on the surface above the array
the baryon neutrino
the electron neutrino

11 Complete the text:

Match up the radiation letter with each of the detector possibilities below:
Meteors - A
Cosmic rays - B
Neutrons - C
Protons - D
Electrons - E
Positrons - F
Neutrinos - G
Muons - H
Gamma rays - I
X-rays - J
Ultraviolet rays - K
Optical rays - L
Visual rays - M
Violet rays - N
Blue rays - O
Cyan rays - P
Green rays - Q
Yellow rays - R
Orange rays - S
Red rays - T
Infrared rays - U
Submillimeter rays - V
Radio rays - W
Superluminal rays - X
multialkali (Na-K-Sb-Cs) photocathode materials


511 keV gamma-ray peak


broad-band filter centered at 404 nm

a cloud chamber

ring-imaging Cherenkov


effective area is larger by 104



a blemish about 8,000 km long

a metal-mesh achromatic half-wave plate

coated with lithium fluoride over aluminum

thallium bromide (TlBr) crystals


aluminum nitride

heavy water

18 micrometers FWHM at 490 nm

wide-gap II-VI semiconductor ZnO doped with Co2+ (Zn1-xCoxO)

a recoiling nucleus

high-purity germanium

magnetic deflection to separate out incoming ions

2.2-kilogauss magnet used to sweep out electrons


12 True or False, The electron reflectometer (ER) aboard the Lunar Prospector determines the location and strength of magnetic fields from the energy spectrum and direction of electrons.


13 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

14 What negatively charged particles may be used as tracers of cosmic magnetic fields?

15 The electron and ion currents of the cosmogonic shadow effect are given by

et al., 1984.

16 Which of the following are associated with electromagnetics?

angular momentum transfer
solar wind
the baryon neutrino
charge neutralization

17 True or False, The instrument measures the pitch angles of solar wind electrons reflected from the Moon by lunar magnetic fields.


18 Ashen light is involved in which of the following?

glow of the bright part of the lunar disk
light from different parts of Earth are mixed together
mimics the Earth as a single dot
neutron astronomy
X-ray astronomy

19 Spin-charge separation has which characteristics?

a chargon
a spinon
taking place inside solids
extremely tight confinement
neutron affinity
X-ray absorption

20 What are some of the characteristics of Jovian electrons?

hard spectrum
Jovian electrons near Earth are on their way to the Sun
an energy power law
flux increases with 27 day periodicities
at 1 AU, flux decreases exhibit a short-term modulation of 13 minutes
come in mutable varieties

Hypotheses[edit | edit source]

  1. The quiz may need more technical questions.

See also[edit | edit source]

External links[edit | edit source]

{{Radiation astronomy resources}}