The displacement-time graphs for two sound waves $A$ and $B$ are shown in the figure, then the ratio of their intensities ${I_A}/{I_B}$ is equal to
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(d) Intensity $ \propto\,{a^2}{\omega ^2}$
here $\frac{{{a_A}}}{{{a_B}}} = \frac{2}{1}$ and $\frac{{{\omega _A}}}{{{\omega _B}}} = \frac{1}{2}$
==> $\frac{{{I_A}}}{{{I_B}}} = {\left( {\frac{2}{1}} \right)^2} \times {\left( {\frac{1}{2}} \right)^2} = \frac{1}{1}$
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