Question
$A$ is singing a note and at the same time $B$ is singing a note with exactly one-eighth the frequency of the note of $A$. The energies of two sounds are equal, the amplitude of the note of $B$ is
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Answer
(d) Energy $ \propto \,\,{a^2}{n^2}$
==> $\frac{{{a_B}}}{{{a_A}}} = \frac{{{n_A}}}{{{n_B}}}$ ($\because$ energy is same)
==> $\frac{{{a_B}}}{{{a_A}}} = \frac{8}{1}$
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