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JAMB Physics 2006 Question 39

Question 39

Sound

The wavelength of the first overtone of a note in a closed pipe of length 33cm is

  1. A.44cm.
  2. B.33cm.
  3. C.22cm.
  4. D.17cm.
Show the answer and explanation

Answer: A (44cm.)

Explanation

In a closed pipe the first overtone has L = 3λ/4, so λ = 4L/3 = 4 × 33 ÷ 3 = 44 cm.