First slide

Standing waves

Question

A pipe of length 1 m is closed at one end. The velocity of sound in air is 300 m/s. The air column in the pipe will not resonate for sound of frequency

Moderate

A

75 Hz
B

225 Hz
C

300Hz
D

375 Hz

Solution

For a closed pipe at one end, the resonant frequencies are
$n = (2 k + 1) (\frac{V}{4 t}) where k = 0, 1, 2, 3, â¦ = (2 k + 1) \frac{300}{4 â¦ 1} = (2 k + 1) Ã 75 = 75' 225' 375, 525 So, the pipe will not resonaie for sound of ftequeucy 300 H 2 .$

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