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  • Draw a curve showing density or pressure variations with respect to distance for a disturbance produced by sound. Mark the position of compression and rarefaction on this curve. Also define wavelengths and time period using this curve.

Draw a curve showing density or pressure variations with respect to distance for a disturbance produced by sound. Mark the position of compression and rarefaction on this curve. Also define wavelengths and time period using this curve.

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In propagation of sound, the particle of medium oscillate.
The time to complete one oscillation is called time period T.

Pitch is frequency of sound, which tells us number of oscillations, any particle will make in one second.

f=\frac{1}{T}

Distance between two consecutive crest or consecutive troughs is equal to wavelength of any sound.

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