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A is singing a note and at the same time...

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

A

Same that of A

B

Twice as that of A

C

Four times as that of A

D

Eight times as that of A

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The correct Answer is:
D
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