Two opens organ pipes of length $50\, cm$ and $50.5\, cm$ produce three beats. Then, the velocity of sound is ..... $m/s$
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$\frac{\mathrm{v}}{2 \ell_{1}}-\frac{\mathrm{v}}{2 \ell_{2}}=3$
$\frac{\mathrm{v}}{1}-\frac{\mathrm{v}}{1.01}=3$
$v=\frac{3 \times 1 \times 1.01}{0.01}$
$\mathrm{v}=303 \mathrm{\,m} / \mathrm{s}$
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