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Question

A pendulum has a frequency of 5 vibrations per second. An observer starts the pendulum and fires a gun simultaneously. He hears the echo from a cliff after 8 vibrations of the pendulum.

 If the velocity of the sound in air is 340 m/s, what is the distance between the cliff and the observer? 


  1. 544 m

  2. 700 m

  3. 170 m

  4. 272 m


Solution

The correct option is D

272 m


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