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AP® Physics 1 & 2

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Moderate

Closed Pipe Harmonic

APPH12-AZJFBU

A certain pipe that is closed at one end has length $L$, and sound waves travel in the pipe at the speed $v$. This pipe is sounding the first harmonic above its fundamental frequency.

Which one of the following is a correct expression for the frequency of the note that the pipe is sounding?

A

$\frac { v }{ 4L } $

B

$\frac { 3v }{ 4L } $

C

$\frac { v }{ 2L } $

D

$\frac { 3v }{ 2L } $