To change the quality of sound produce by an instrument, we need to vary the :
A
number of overtones
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B
pitch
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C
loudness
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D
amplitude
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Solution
The correct option is A number of overtones Quality is that characteristic of sound which differentiate between two sounds even when they are of same intensity and same pitch , and it depends upon the number of overtones . Pitch will change the frequency of sound .Loudness will change the vibrational energy .Amplitude will change the intensity of sound .