Radiation astronomy/Microwaves/Quiz

Microwave astronomy is a lecture from the radiation astronomy department that is included in the course principles of radiation astronomy.

This image shows the variations in the lunar gravity field as measured by NASA's Gravity Recovery and Interior Laboratory (GRAIL) during the primary mapping mission from March to May 2012. Credit: NASA/JPL-Caltech/MIT/GSFC.

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1 Complete the text:

In the case of electric

radiation, the associated fluctuation in angular

is due to absorption of and decays stimulated by

photons (dominated by Cosmic Microwave Background (CMB) photons in the



2 Yes or No, Locations exist which have a lower temperature than the CMB.


3 Complete the text:

Match up the letter with the frequency range possibilities below:
microwaves - L
RF - P
Submillimeters - Q
IR - R
Visible rays - S
UV - T
X-rays - U
γ-rays - V
30 PHz to 30 EHz

0.3 GHz to 300 GHz

300 GHz to 3 THz

790 THz to 30 PHz

300 MHz to 3 GHz

300 GHz to 430 THz

> 30 EHz

30 to 300 GHz

430 THz to 790 THz

3 kHz to 300 GHz

3 to 30 GHz


4 True or False, Radio rays have wavelengths of one millimeter or more.


5 Complete the text:

Astronomers place the submillimetre waveband between the


wavebands, typically taken to be between a few hundred micrometres and a millimetre.

6 Yes or No, Microwaves have wavelengths of one millimeter or more up to a meter.


7 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

8 Complete the text:

The peak emissivity is enhanced by about 23% for the

(WIM) and only 11 % for the

(WNM), although the peak frequency remains unchanged.

9 True or False, The position of the Sun can be determined directly with the use of microwave astronomy.


10 Complete the text:

The cosmic microwave background radiation is a

glow that fills the

in the

part of the



  1. Microwaves may have been used more extensively to study the Solar System.

See alsoEdit

External linksEdit

{{Radiation astronomy resources}}