# Intensity astronomy/Quiz

This gamma-ray spectrum contains the typical isotopes of the uranium-radium decay line. Credit: Wusel007.

Intensity astronomy is a lecture. It is an offering from the radiation astronomy department. Although under development, it may eventually be used as a lecture in the advanced undergraduate course principles of radiation astronomy.

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## Quiz

1 Yes or No, A time-averaged flux is called an intensity.

 Yes No

2 True or False, Intensity astronomy focuses on creating a sufficient intensity for a desired property or characteristic that a signal may be converted in a detector to an electric current.

 TRUE FALSE

3 Which of the following are theoretical radiation astronomy phenomena associated with a satellite in orbit around the Earth?

 background radiation a charged particle wind which emanates out of a beam line gravity near the barycenter for the Earth-Moon system swirls of tan, green, blue, and white in the water electric arcs intensity of radiation

4 Yes or No, Visually dark infrared sources can be radiative cosmic dust, hydrogen gas such as an H II region (e.g. the Orion Nebula), an H I region of hydrogen, a molecular cloud, or a coronal cloud.

 Yes No

5 A cosmic ray may originate from what astronomical source?

 Jupiter the solar wind the diffuse X-ray background Mount Redoubt in Alaska the asteroid belt an active galactic nucleus

6 True or False, Each element has electronic orbitals of characteristic energy.

 TRUE FALSE

7 Complete the text:

 Cosmic rays with energies over the energy of 5 x 1019 interact with photons to produce via the ${\displaystyle \Delta }$ resonance.

8 Complete the text:

 A proof-of-concept structure, including a control group, consists of , procedures, findings, and .

9 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

10 Which of the following are likely associated with the intensity of a green emission line?

 rocky objects high peak to background plasma objects a G2V photosphere rotation watery surface spots

## Hypotheses

1. Intensity-based questions may require extensive facility with detectors.