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JAMB Physics 1992 Question 23

Question 23

Sound

What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolutions per second?

  1. A.80 Hz
  2. B.600 Hz
  3. C.800 Hz
  4. D.1600 Hz
Show the answer and explanation

Answer: C (800 Hz)

Explanation

Each hole gives one puff of air per revolution: f = 32 × 25 = 800 Hz.