In a resonance tube experiment, which is illustrated above, the velocity of sound in air...

JAMB 1979

In a resonance tube experiment, which is illustrated above, the velocity of sound in air is 327.68m/s, the frequency of the turning fork used is therefore?

A. 128HZ
B. 256HZ
C. 512HZ
D. 768HZ
E. 1024HZ

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Correct Answer: Option C

Explanation

for close pipes, the frequency is given as F=nv/4l while for opened pipes it is f=nv/2l

the number of harmonics,n is 1. Which is the fundamental note.

f=1 X 327.68 /4 X 0.16

f=327.68/0.64

f=512HZ

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