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For a certain organ pipe, three successi...

For a certain organ pipe, three successive resonance frequencies are observed at 400 Hz, 560 Hz and 720 Hz.
The fundamental frequency of the pipe is

A

60 Hz

B

70 Hz

C

80 Hz

D

90 Hz

Text Solution

Verified by Experts

The correct Answer is:
C
The frequencies are in the ratio of `400 : 560 : 760 : 720 ` i.e. `5 : 7 : 9 " or " 80 xx 5 : 80 xx 7 : 80 xx 9`.
` :. ` The fundamental frequency is 80 Hz.
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