First slide

Stationary waves

Question

The length of a sonometer wire tuned to a frequency of 250 Hz is 0.60 metre. The frequency of tuning fork with which the vibrating wire will be in tune when the length is made 0.40 metre is

Moderate

A

250 Hz
B

375 Hz
C

256 Hz
D

384 Hz

Solution

$n_{1} l_{1} = n_{2} l_{2} \Rightarrow 250 \times 0 .6 = n_{2} \times 0 .4 \Rightarrow n_{2} = 375$

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