Question

A rocket is receding away from
earth with velocity 0.2 c. The
rocket emits signal of frequency 4
x 107 Hz. The apparent frequency
observed by the observer on earth
will be
A. 4 x 106 Hz
B. 3.2 x 107 Hz
c. 3 x 106 Hz
D. 5 x 107 Hz​

Answer 1

Explanation:

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Answer 2

I cannot understand it sorry I will not help you in this question