Ratio of amplitude of two wave is 9:1 then the ratio of intensities will be

81:1

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3:1

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4:1

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none

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Solution

The correct option is A 81:1
Since intensity $α (a m p l i t u d e)^{2}$
Since ratio of amplitude is 9:1 then ratio of intensities will be $(9)^{2} : (1)^{2} = 81 : 1$

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