User:Marshallsumter/Radiation astronomy1/Positrons/Quiz

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

You are free to take this quiz based on positron 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 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.

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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
{True or False, Any clumpiness in the galactic halo is through a spatially continuous elevation in the density of dark matter, rather than the more realistic discrete distribution of clumps. + TRUE - FALSE
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{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 { C (i) } the index of refraction is often greater than 1 just below a resonance frequency { H (i) }. iron, nickel, cobalt, and traces of iridium { A (i) }. Sagittarius X-1 { G (i) }. escape from a typical hard low-mass X-ray binary { F (i) }. collisions with argon atoms { B (i) }. X-rays are emitted as they slow down { E (i) }. Henry Moseley using X-ray spectra { D (i) }.
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{True or False, By crossing symmetry an elastic scattering cross section with a nucleon implies annihilation of dark matter (DM) into hadrons inside the halo, resulting in an anti-proton flux that could be constrained by data from the PAMELA collaboration if one includes a large boost factor necessary to explain the PAMELA excess in the positron fraction. + TRUE - FALSE
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{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 { L (i) }. F547M { Q (i) }. 511 keV gamma-ray peak { F (i) }. F675W { T (i) }. broad-band filter centered at 404 nm { N (i) }. a cloud chamber { B (i) }. ring-imaging Cherenkov { X (i) }. coherers { W (i) }. effective area is larger by 104 { H (i) }. F588N { R (i) }. pyroelectrics { U (i) }. a blemish about 8,000 km long { A (i) }. a metal-mesh achromatic half-wave plate { V (i) }. coated with lithium fluoride over aluminum { K (i) }. thallium bromide (TlBr) crystals { O (i) }. F606W { S (i) }. aluminum nitride { J (i) }. heavy water { G (i) }. 18 micrometers FWHM at 490 nm { P (i) }. wide-gap II-VI semiconductor ZnO doped with Co2+ (Zn1-xCoxO) { M (i) }. a recoiling nucleus { C (i) } high-purity germanium { I (i) }. magnetic deflection to separate out incoming ions { E (i) }. 2.2-kilogauss magnet used to sweep out electrons { D (i) }.
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{True or False, A quantum number that depends upon the relative number of strange quarks and anti-strange quarks is called a quarkness. - TRUE + FALSE
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{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
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{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
 * type=""}

{Yes or No, An antimatter equivalent of an electron having the same charge but a positive mass is called a positron. - Yes + No
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{Complete the text: Match up the item letter with each of the first astronomical source possibilities below: Meteors - A Cosmic rays - B Neutrons - C Protons - D Electrons - E Positrons - F Gamma rays - G Superluminals - H cosmic rays { C|D (i) } galactic nuclei { H (i) }. comets { A (i) }. electron-positron annihilation { G (i) }. weak force nuclear decay { F (i) }. AGNs { B (i) }. 511 keV photon pair production { E (i) }. solar wind { D (i) }.
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{True or False, An antimatter equivalent of a positron having the same mass but a positive charge is called an electron. - TRUE + FALSE
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{Which of the following are characteristic of a β+ decay? - a mu neutrino + a positron emission - a decay product of a neutron + weak interaction + an electron neutrino - comes in mutable varieties
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{True or False, A positron under suitable conditions could be separated into a chargon and a spinon. + TRUE - FALSE
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{Which of the following are characteristic of positronium? + an exotic atom - a nucleus of neutronium - a decay product of a neutron - a weak interaction + an eletromagnetic interaction + a center of mass
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{True or False, If a positive chargon and a negative chargon interact, a gamma ray without a wavelength results. - TRUE + FALSE
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Hypotheses

 * 1) Positrons, especially those traveling at very close to light speed, are directly detectable.