Q.

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

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a

128 Hz

b

256 Hz

c

384 Hz

d

500 Hz

answer is D.

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Detailed Solution

V=  or  n=V/λ  Here λ=2x2x1 =2(084050)=068 n=340068=500Hz 

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