the ratio of amplitudes of two waves is 4:9 . what is the ratio of their intensities?

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Solution

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$I α A^{2} \frac{I_{1}}{I_{2}} = \frac{{A_{1}}^{2}}{{A_{2}}^{2}} = \frac{4^{2}}{9^{2}} = \frac{16}{81}$

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