First slide

Experiments to find speed of sound

Question

A tuning fork of frequency 340Hz is vibrated just above a cylindrical tube of length 120cm. Water is slowly poured in the tube. If the speed of the sound in air is 340m/s the minimum height of the water required for resonance is

Easy

A

25 cm
B

45 cm
C

75 cm
D

60 cm

Solution

$U s e \frac{V}{4 L} = n \Rightarrow L = \frac{V}{4 n}$

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