Two vibrating tuning forks produce progressive waves given by $Y_1 = 4\, sin\, 500\pi t$ and $Y_2 = 2\, sin\, 506\, \pi t$ Number of beats produced per minute is
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Number of beats per seocnd $=\mathrm{n}_{2}-\mathrm{n}_{1}=3$
$\left(\because n_{1}=250, n_{2}=253\right)$
$\Rightarrow$ Number of beats produced per minute $=3 \times 60=180$
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