For a certain organ pipe, three successi...

For a certain organ pipe, three successive harmonics are 300 Hz, 420 Hz and 540 Hz. What is the frequency of the first overtone ?

A

120 Hz

B

180 Hz

C

200 Hz

D

240 Hz

Text Solution

Verified by Experts

The correct Answer is:

B

It is a pipe closed at one end as only odd harmonics are heard.
` 540 - 420 = 420 - 300 = 120 = 2n`
` :. N = 60` Hz and the first overtone ` = 3n = 180` Hz

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