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Which characteristic of a vibrating body determines the (a) loudness (b) pitch of the sound produced by it ?

(a) Loudness is determined by the amplitude of vibrating body.
(b) Pitch is determined by the frequency of vibrating body.

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a) Amplitude
b) Frequency 
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a) Loudness depends upon the amplitude of the sound. Loudness is actually the square of the sound's amplitude.
b) Pitch depends on the frequency of the sound. A sound that is shrill or of high pitch has more frequency than one with deep or low pitch which has lower frequency.
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