Two close organ pipe having length $20\,cm$ and $20.5\, cm$ produce $5\, beats/sec$. Determine the frequency of both organ pipe
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$y_1=5 \sin 2 \pi(75 t-0.25 x)$
$y_2=10 \sin 2 \pi(150 t-0.50 x)$
The intensity ratio $\frac{I_1}{I_2}$ of the two waves is