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JAMB Physics 2014 Question 27

Question 27

Sound

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill? [speed of sound in air = 340ms−1]

  1. A.66 m.
  2. B.136 m.
  3. C.264 m.
  4. D.528 m.
Show the answer and explanation

Answer: B (136 m.)

Explanation

The sound goes to the hill and back: 2d = vt = 340 × 0.8 = 272 m, so d = 136 m.