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A tube of a certain diameter and of leng...

A tube of a certain diameter and of length `48cm` is open at both ends. Its fundamental frequency is found to be `320 Hz`. The velocity of sound in air is `320 m//sec`. Estimate the diameter of the tube.
One end of the tube is now closed. Calculate the lowest frequency of resonance for the tube.

A

`1.33cm`

B

`2.33cm`

C

`3.33cm`

D

`4.33cm`

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The correct Answer is:
C
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