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Q.

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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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

answer is D.

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Detailed Solution

Energy ∝ a2n2⇒aBaA=nAnB (∵ energy is same)⇒aBaA=81

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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