Q141 / 170 · Manipal (MET) 2021 · Physics

A stretched sonometer wire is in unison with a tuning fork. When length of wire is increase by $1 \%$, the number of beats heard per second is 5. Then the frequency of the fork is :

A
500 Hz
Correct answer
B
505 Hz
C
255 Hz
D
250 Hz

Solution

Let frequency of tuning fork be $n_1$ $\frac{n_2}{n_1}=\frac{100}{101}$ As $n_1-n_2=5$ So, $n_1=505 \mathrm{~Hz}$

Hence, the correct answer is option: 'B'.

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