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JAMB Physics 2023 Question 15

Question 15

Sound

In a resonance tube experiment which is illustrated above, the velocity of sound in air is 327.68m/s, the frequency of the turning fork used is therefore

Diagram for this question
  1. A.128Hz
  2. B.256Hz
  3. C.512Hz
  4. D.768Hz
Show the answer and explanation

Answer: C (512Hz)

Explanation

At the first resonance the 16 cm air column is a quarter wavelength: λ = 4 × 0.16 = 0.64 m. f = v/λ = 327.68 ÷ 0.64 = 512 Hz.