Wed March 16, 2011 By: Divya Khare

A man stands at rest in front of a large smooth wall.Directly infront of him, between him and wall he holds a vibrating tuning fork of frequency 400Hz.He now moves the fork towards the wall with a speed of 1m/s.How many beats will he hear between the sound waves reaching him directly from the fork, and those reaching him after being reflected from wall?

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Wed April 13, 2011
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