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Two different sound sources s1 and so ha...

Two different sound sources `s_1` and so have frequencies ratio 1:2. Source `s_2` is approaching towards an observer `s_1` and `s_2` is receding from the same observer. Speeds of both `s_1` and `s_2` are the same and equal to v. speed of sound in air in 300 m / s. If no beats are heard by the observer the value of V is

A

125 m/s

B

100 m/s

C

75 m/s

D

50 m/s

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The correct Answer is:
B
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