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JAMB Physics 2002 Question 13

Question 13

Sound

I. Temperature. II. Density of air molecules. III. Pressure. IV. Pitch.
Which of the above will affect the velocity of sound in air?

  1. A.I, II, III and IV.
  2. B.I, II and IV only.
  3. C.II and IV only.
  4. D.I and II only.
Show the answer and explanation

Answer: D (I and II only.)

Explanation

The speed of sound in air depends on temperature and on the density of the air; pressure alone (at fixed temperature) and pitch do not change it.