(a) Adiagrammaticexplanation of the statement that when the 21 cm radiation is observed from the clouds of atomic hydrogen at an angle of 45 ° from the galactic center. The Doppler shift is observed from the cloud that is far from the galactic center as it is from the Sun.

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Chapter 22, Problem 18Q

To determine

(a)

Adiagrammaticexplanation of the statement that when the 21 cm radiation is observed from the clouds of atomic hydrogen at an angle of 45° from the galactic center. The Doppler shift is observed from the cloud that is far from the galactic center as it is from the Sun.

To determine

(b)

The distance from the Sun to the particular cloud mentioned in part (a).

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