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Q.
Quality of sound primarily depends upon
Waves
Solution:
The quality depends primarily on the waveform of the sound. The waveform of the sound emitted by a tuning fork is a simple sine curve.
But most bodies vibrate in a very complex manner.
Besides the fundamental frequency $f$, they consist of additional frequencies of $2 f , 3 f, 4f,$ etc.
These additional tones are called overtones or harmonics.
According to Helmholtz, the quality is determined by the number, relative frequency and intensities of the component simple tones of which a complex vibration is composed of.