Radiation astronomy/Gamma rays/Quiz

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Positions on the sky of all gamma-ray bursts detected during the BATSE mission are shown. Credit: .

Gamma-ray astronomy is a lecture and an article from the astronomy department for the course on the principles of radiation astronomy.

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Quiz[edit | edit source]


1 True or False, Some cosmic-ray observatories also look for high energy gamma rays and X-rays.


2 Which of the following are astronomical observatory phenomena associated with gamma-ray astronomy?

20 MeV electromagnetic radiation
the Second Small Astronomy Satellite (SAS-2)
micrometre-sized interstellar meteor particles
neutron irradiation
meteor orbits
thorium on the Moon

3 Yes or No, The Hubble Space Telescope is currently capable of gamma-ray imaging.


4 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

5 True or False, The first gamma-ray telescope was carried into orbit aboard OSO 3.


6 Complete the text:

Match up the imaging system letter with the image possibilities below:
Compton Gamma Ray Observatory (EGRET) - A
XMM Newton - B
Fermi Gamma-ray Space Telescope - C
Lunar Orbiter Gamma-Ray Spectrometer - D
Mars Odyssey GRS - F
Swift (X-ray/Gamma-ray mission) - H
PIA04256 Map of Martian Silicon at Mid-Latitudes.jpg


Moon egret.jpg

GRB 080319B.jpg


267641main allsky labeled HI.jpg




7 True or False, The distribution of gamma-ray bursts is tetratropic.


8 On what date was GRB 970228 discovered?

August 22, 1997
February 28, 1997
September 7, 2002.28
1982 the 20th between July and September
2009 July 22nd and 8 hours
February 14, 2014

9 True or False, On July 2, 1967, at 14:19 UTC, the Vela 4 and Vela 3 satellites detected a flash of gamma radiation that was unlike any known nuclear weapons signatures.


10 Pick the characteristics of gamma-ray burst.

a strong 2.223 MeV emission line
flashes of gamma rays
associated with extremely energetic explosions
most luminous events known
can last from ten milliseconds to several minutes
followed by a longer-lived "afterglow"

11 True or False, In 2005, ESO telescopes detected, for the first time, the visible light following a short-duration burst and tracked this light for three weeks.


12 Which types of radiation astronomy directly observe the rocky-object surface of Venus?

meteor astronomy
cosmic-ray astronomy
neutron astronomy
proton astronomy
beta-ray astronomy
neutrino astronomy
gamma-ray astronomy
X-ray astronomy
ultraviolet astronomy
visual astronomy
infrared astronomy
submillimeter astronomy
radio astronomy
radar astronomy
microwave astronomy
superluminal astronomy

13 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


14 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


15 Which of the following are cold dark matter gamma rays?

expected signal comparable to background
annihilation radiation
a pronounced cosmic-ray halo
difficult to separate from a dark halo
dwarf spheroidals
weakly interacting massless particles

Hypotheses[edit | edit source]

  1. Gamma rays may hold the key to conversion of electromagnetic radiation back into matter.

See also[edit | edit source]

External links[edit | edit source]

{{Radiation astronomy resources}}