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The number of possible natural oscillati...

The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are (velocity of sound `=340ms^(-1)`).

A

`6`

B

`4`

C

`5`

D

`7`

Text Solution

Verified by Experts

The correct Answer is:
A
`(nv)/(21)=1250` gives `n=6.5`
So, `6` cases can be obtained these are
`(v)/(2l)`, `(3v)/(2l)`, `(5v)/(2l)`, `(7v)/(2l)`, `(9v)/(2l)`, `(11v)/(2l)`
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