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.

Explanation

We have a curve showing density or pressure variations with respect to distance for a disturbance produced by sound.

Wavelength can be defined as the distance between to successive compression or rarefaction. It is denoted by `lambda`.
Time taken by the waves to complete one full cycle, so that its particles are in same phase is called time period. It is denoted by T.