A whistle you use to call your hunting dog has a frequency of 21kHz , but your d

Question

A whistle you use to call your hunting dog has a frequency of 21kHz, but your dog is ignoring it. You suspect the whistle may not be working, but you can't hear sounds above20kHZ. To test it, you ask a friend to blow the whistle, then you hop on your bicycle.
In which direction should you ride (toward or away from your friend) to know if the whistle is working?

In which direction should you ride (toward or away from your friend) to know if the whistle is working?

Explanation / Answer

You have to ride at such a rate that 21kHz sounds to be 20kHz. So,according to doppler effect you need to ride at 1/21 x the velocity of sound. Taking speed of sound as 343m/sec., the rate u should ride is (343/21) = 16.334m/sec.

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