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Mechanical Properties of Fluids
Question
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Car A is following the car B. Both are moving with same velocity. The driver of car A claps at regular interval T. What will be the time interval between two successive claps as heard by the driver of car B?

Answer

The relative velocity of car B w.r.t. car A is zero.
Therefore, the apparent frequency of clapping is same as that of actual.
Hence, the time interval between two successive claps heard by the driver of car B is also T.

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