Fig. shows wave patterns of three sounds a, b and c. Name the characteristic of sound which is same between c and a.

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Solution

The characteristic of sound that is common between the figures a and c is frequency or pitch.
Pitch is determined by the frequency of a wave, and frequency is the combination of wavelength and speed at which the wave is traveling. Pitch describes how high or low a tone is and depends upon the rapidity with which a sounding body vibrates, i.e., upon the frequency of vibration. The higher the frequency of vibration, the higher the tone or pitch.
In the figure a and c the frequency is the same, but the amplitude or loudness and quality or waveforms are different.

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