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JAMB Physics 1990 Question 32

Question 32

Sound

An organ pipe closed at one end is 80 cm long. Determine the frequency of the fundamental note assuming that the speed of sound in air is 340 m s−1.

  1. A.106 Hz
  2. B.213 Hz
  3. C.318 Hz
  4. D.425 Hz
Show the answer and explanation

Answer: A (106 Hz)

Explanation

For a closed pipe λ = 4L = 3.2 m, so f = 340/3.2 ≈ 106 Hz.