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(D) The intensity $I$ of a progressive plane wave in a medium of density $\rho$ is given by the formula: $I = 2\pi^2 n^2 a^2 \rho v$ where $n$ is the

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All of the above

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(D) The intensity $I$ of a progressive plane wave in a medium of density $\rho$ is given by the formula: $I = 2\pi^2 n^2 a^2 \rho v$ where $n$ is the frequency,$a$ is the amplitude,and $v$ is the wave velocity. From this expression,it is clear that: $1. I \propto a^2$ (Directly proportional to the square of amplitude) $2. I \propto v$ (Directly proportional to the velocity) $3. I \propto n^2$ (Directly proportional to the square of frequency) Therefore,all the given statements are correct. Hence,the correct option is $D$.

The intensity of a progressing plane wave in a loss-free medium is

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