A tuning fork gives $4$ beats with $50\, cm$ length of a sonometer wire if the length of the wire is shortened by $1\, cm$. the no. of beats still the same. The frequency of the fork is -............. $\mathrm{Hz}$
A$396$
B$400$
C$404$
D$384$
Medium
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A$396$
a $n \propto \frac{1}{l}$
$\frac{n-4}{n+4}=\frac{49}{50}$
$\mathrm{n}=396 \mathrm{\,Hz}$
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