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JEE PHYSICS MCQ: WAVE OPTICS

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A rocket is going towards moon with a speed

v

. The astronaut in the rocket sends signals of frequency

v

towards the moon and receives them back on reflection from the moon. What will be the frequency of the signal received by the astronaut (Take

v \ll c

)

View answer and explanation

Correct option: B

\frac{c}{{c - 2v}}v

Option B,

\frac{c}{{c - 2v}}v

, is correct because it accounts for the Doppler effect twice: once as the signal travels to the moon and again as it returns to the astronaut.

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