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A long glass tube is held vertically in water. A tuning fork is struck and held over the tube. Strong resonances are observed at two successive lengths `0.50 m` and `0.84 m` above the surface of water. If the velocity of sound is `340 m//s`, then the frequency of the tuning fork is

A

`128 Hz`

B

`256 Hz`

C

`384 Hz`

D

`50 Hz`

Text Solution

Verified by Experts

The correct Answer is:
D
`(lambda)/(2) = 0.84 - 0.50 = 0.34`
`lambda = 0.68 m`
`v = f lambda rArr f = (v)/(lambda) = (340)/(0.68) = 500 Hz`
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  14. A source and a listener are both moving towards each other with speed ...

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  15. A source of sound is travelling towards a stationary observer. The fre...

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  16. The difference between the apparent frequency of a sound of soun as pe...

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  17. A train is moving at 30 m//s in still air. The frequency of the locomo...

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