Fill in the blank.
Loudness of a sound is proportional to ______ of the amplitude of the vibration producing the sound.

square

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half

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cube

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quarter

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Solution

The correct option is B square
The loudness is proportional to the square of the amplitude of vibration. Thus, if the loudness of a sound is $64$ then the amplitude is $8$ .

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Loudness of a sound is proportional to the square of the amplitude of the vibration producing the sound. Explain

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(a) Time taken by an object to complete one oscillation is called _________.

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(e) Shrillness of a sound is determined by the _________ of vibration.

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