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JAMB Physics 1993 Question 22

Question 22

Sound

Which of the following waves can propagate through a vacuum?

  1. A.High velocity sound waves
  2. B.Ultrasonic waves
  3. C.Acoustic waves
  4. D.Infra-red waves.
Show the answer and explanation

Answer: D (Infra-red waves.)

Explanation

Sound waves of any kind need a material medium; infra-red is an electromagnetic wave and travels through a vacuum.