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A glass tube 1.5 m long and open at both...

A glass tube `1.5 m` long and open at both ends, is immersed vertically in a water tank completely. A tuning fork of 660 Hz is vibrated and kept at the upper and of the tube and the tube is gradually raised out of water the total number of resonances heard before the tube comes out of water taking velocity of sound air `330m//s` is

A

`12`

B

`6`

C

`8`

D

`4`

Text Solution

Verified by Experts

The correct Answer is:
B
Suppose N resonance occurred before tube coming out.
Hence by using `l=((2N-1)v)/(4n)`
`implies1.5=((2N-1)xx330)/(4xx660)impliesNapprox6`
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