Author Question: What information does 21 cm radiation provide about the gas clouds? A) their motion B) their ... (Read 19 times)

jerry coleman · **on:** Jul 27, 2018

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

A) their motion
B) their distribution
C) their density
D) their temperature
E) all of these

Question 2

What is spectral resolution? Why can a large telescope allow for a higher spectral resolution than a smaller telescope?

What will be an ideal response?

carolinefletcherr · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

E

Answer to Question 2

Spectral resolution is a measure of the amount of detail that can be seen in a spectrum (i.e., how well it can separate out two spectral features from each other). It depends on how widely the light from a telescope is spread out, but the trade-off is that the more the light is spread out, the dimmer it becomes until it becomes undetectable. Since a large telescope gathers more light than a smaller telescope, it can spread the light out further and achieve a higher resolution.