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JAMB Physics 2003 Question 18

Question 18

Sound

An open pipe closed at one end produces its first fundamental note. If the velocity of sound in air is v and l the length of the pipe, the frequency of the note is

  1. A.2v/l
  2. B.v/5l
  3. C.v/4l
  4. D.v/2l
Show the answer and explanation

Answer: C (v/4l)

Explanation

For a pipe closed at one end the fundamental has λ = 4l, so f = v/(4l).