The velocity of sound in a gas. in which two wavelengths $4.08\,m$ and $4.16\,m$ produce $40$ beats in $12\,s$, will be ..............$ms ^{-1}$
JEE MAIN 2022, Medium
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$f_{b}=f_{1}-f_{2}$
$\frac{v}{4.08}-\frac{v}{4.16}=\frac{40}{12}$
$\Rightarrow v =707.2$
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