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The energy per unit area associated with a progressive sound wave will be doubled if

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the amplitude of the wave is increased by 50 %

the amplitude of the wave is doubled

the amplitude of the wave is increased by 43 %

the frequency of the wave is increased by 43 %

answer is C, D.

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Detailed Solution

$E \propto A^{2} \Rightarrow \sqrt{E} \propto A$

So, E is doubled is if amplitude A is increased by 43%

$and E \propto n^{2} \Rightarrow \sqrt{E} \propto n$

So, E is doubled is if frequency n is increased by 43%

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