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JAMB Physics 1993 Question 20

Question 20

Sound

The figure shows a stationary wave in a closed tube. The relationship between L and the wavelength λ of the stationary wave is

Diagram for this question
  1. A.2L = λ
  2. B.L = λ
  3. C.L = λ/3
  4. D.4L = 3λ.
Show the answer and explanation

Answer: D (4L = 3λ.)

Explanation

From the open end (antinode) to the closed end (node) the tube holds three quarter-wavelengths: L = 3λ/4, so 4L = 3λ.