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JAMB Physics 2011 Question 21

Question 21

Sound

Which of the following types of waves needs a medium for preparation?

  1. A.Radio waves.
  2. B.X-rays.
  3. C.Sound waves.
  4. D.Light waves.
Show the answer and explanation

Answer: C (Sound waves.)

Explanation

Sound is a mechanical wave and needs a material medium to travel. Radio waves, X-rays and light are electromagnetic and can cross a vacuum.