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A pipe of length 85cm is closed from one...

A pipe of length `85cm` is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below `1250 Hz`. The velocity of sound in air is `340m//s`.

A

6

B

4

C

12

D

8

Text Solution

Verified by Experts

The correct Answer is:
A
In fundamental
`(lambda)/(4)=0.85` , `lambda=4xx0.85`
`f=(V)/(lambda)=(340)/(4xx0.85)=100 Hz`
`therefore` Possible frequencies = 100 Hz, 300 Hz, 500 Hz, 700 Hz, 900 Hz, 1100 Hz below 1250 Hz..
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