Intensity (I) is related to amplitude (A) as:

I \propto A

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I \propto A^{2}

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I \propto A^{4}

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I \propto A^{- 1}

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Solution

The correct option is A $I \propto A^{2}$
Intensity of a wave is directly proportional to the square of amplitude of the wave.
i.e. $I \propto A^{2}$
More is the amplitude of wave, more will be the intensity.
So, we write $I = k A^{2}$
where $k$ is a proportionality constant.

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