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COMEDK2013PhysicsMotion in One Dimension

A man, standing between two cliffs, claps his hands and starts hearing a series of echoes at intervals of one second. If the speed of sound in air is 340 ~ms ⁻¹ , then the distance between the cliffs is

Options

  1. A680 ~m
  2. B1700 ~m
  3. C340 ~m
  4. D1620 ~m

Correct answer

C. 340 ~m

Step-by-step solution

Let x be the distance between a cliff and man, then time taken by the echo, aligned t &= 2 x v =1 x &= v 2 = 340 2 =170 ~m aligned (given) Distance between two cliffs =2 x=2 170=340 ~m

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