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JAMB Physics 2001 Question 18

Question 18

Sound

A string is fastened tightly between two walls 24 cm apart. The wavelength of the second overtone is

  1. A.24 cm
  2. B.16 cm
  3. C.12 cm
  4. D.8 cm
Show the answer and explanation

Answer: B (16 cm)

Explanation

The second overtone is the third harmonic, with three loops: 3 × λ/2 = 24 cm, so λ = 16 cm.