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JAMB Physics 1982 Question 6

Question 6

Sound

The echo of a sounder from the bottom of an ocean is heard 2.5 seconds later. If the speed of sound in water is 1,400 m s−1, the depth of the ocean is

  1. A.1,750 m
  2. B.3,500 m
  3. C.1,400 m
  4. D.2,800 m
  5. E.2,100 m
Show the answer and explanation

Answer: A (1,750 m)

Explanation

In 2.5 s the sound goes down and back, 1400 × 2.5 = 3500 m, so the depth is half of that, 1750 m.