passwella.
Menu

JAMB Physics 1987 Question 28

Question 28

Waves

A boat at anchor is rocked by waves whose crests are 100 m apart and whose velocity is 25 m s−1. At what interval does the wave crests reach the boat?

  1. A.2500.00 s
  2. B.75.00 s
  3. C.4.00 s
  4. D.0.25 s.
Show the answer and explanation

Answer: C (4.00 s)

Explanation

Crests arrive once every period: T = λ/v = 100/25 = 4 s.