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(C) The energy $E$ of a sound wave is proportional to the square of its amplitude $A$ and the square of its frequency $n$. Mathematically, $E \propto

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$4A$

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(C) The energy $E$ of a sound wave is proportional to the square of its amplitude $A$ and the square of its frequency $n$. Mathematically, $E \propto A^2 n^2$.Since the energies of the waves produced by $P$ and $Q$ are equal, we have $E_P = E_Q$.Therefore, $A_P^2 n_P^2 = A_Q^2 n_Q^2$.Given $A_P = A$, $n_P = n$, and $n_Q = n/4$, we substitute these values into the equation:$A^2 n^2 = A_Q^2 (n/4)^2$.$A^2 n^2 = A_Q^2 (n^2 / 16)$.$A^2 = A_Q^2 / 16$.$A_Q^2 = 16 A^2$.Taking the square root of both sides, we get $A_Q = 4A$.

$A$ musical instrument $P$ produces sound waves of frequency $n$ and amplitude $A$. Another musical instrument $Q$ produces sound waves of frequency $n/4$. The waves produced by $P$ and $Q$ have equal energies. The amplitude of waves produced by $Q$ will be

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