Optics Question 260

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 4×107Hz . What will be the frequency observed by an observer on the earth

[RPMT 1996]

Options:

A) 4×106Hz

B) 3.2×107Hz

C) 3×106Hz

D) 5×107Hz

Show Answer

Answer:

Correct Answer: B

Solution:

ν=ν(1vc)=4×107(10.2cc)=3.2×107Hz



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