passwella.
Menu

JAMB Physics 1994 Question 29

Question 29

Sound

The sound from a source travelled to the bottom of the sea and the echo was heard 4s later. If the speed of sound in sea water is 1500 m s−1, the depth of the sea is

  1. A.6000m
  2. B.3000m
  3. C.1500m
  4. D.375m
Show the answer and explanation

Answer: B (3000m)

Explanation

The sound goes down and back in 4 s, so 2d = 1500 × 4 = 6000 m and d = 3000 m.