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Question

A rocket is going away from the earth at a speed 0.2c, where c = speed of light. It emits a signal of frequency 4×107 Hz. What will be the frequency observed by an observer on the earth?

A
4×106 Hz
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B
3.2×107 Hz
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C
3×106 Hz
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D
5×107 Hz
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Solution

The correct option is B 3.2×107 Hz
Frequency observed by an observer on earth will vary as function of speed of rocket and speed of light as follows-
v'=v(1vc)=4×107 (10.2cc)=3.2×107Hz

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