What information does 21 cm radiation provide about the gas clouds?

Question

Quizplus · Accepted Answer

21 cm radiation can be used to determine all of the above information about gas clouds. The motion of the clouds can be determined from Doppler shifts in the 21 cm line, their distribution can be mapped by observing the intensity of the 21 cm radiation across the sky, their density can be inferred by measuring the brightness temperature of the radiation, and their temperature can be estimated from the width of the 21 cm line. 21 cm radiation can be used to determine the motion, distribution, density, and temperature of gas clouds through their spectral lines. Therefore, all the options are correct.

What Information Does 21 Cm Radiation Provide About the Gas