4. If an observer moves towards a source of sound with such as a velocity that the apparent frequeney
heard by him be just double the actual frequency. The velocity of an observer is
(Velocity of sound in air = 330 m/s):
A. 330 m/s
B. 660 m/s
C. 165 m/s
D. 160 m/s
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I think question is wrong
If the question is wrong then you comment me that the question is not wrong.
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