Dependence of disturbances due to two waves on time is shown in the figure. The ratio of their intensities $I_1 / I_2$ will be
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$I \propto {n^2}{a^2}$
$\frac{I_{1}}{I_{2}}=\left(\frac{2}{1} \times \frac{1}{2}\right)^{2}=\frac{1}{1}$
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