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JAMB Physics 1984 Question 15

Question 15

Sound

Which of the following statements is (are) NOT correct? I. Pressure changes do not affect the speed of sound in air. II. The velocity of sound increases with temperature III. The quality of a note depends only on its frequency.

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

Answer: C (III only)

Explanation

At constant temperature pressure does not change the speed of sound, and the speed rises with temperature. Quality depends on the overtones present, not only the frequency, so III is wrong.