Question

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 periods using this curve.

Answer 1

The points of maximum density (or pressure) and minimum density (or pressure) are also called crests and troughs respectively.

Wavelength (A): The distance between two consecutive compressions or two consecutive rarefactions is called wavelength.

Time period (T): Time period of a wave is defined as the time taken by its two consecutive compressions or rarefactions to cross a fixed point.