With the help of a diagram discuss the terms: Amplitude, Time-period and Frequency of a sound wave.

Amplitude--The amplitude of a periodic variable is a measure of its change over a single period (such as time or spatial period). There are various definitions of amplitude (see below), which are all functions of the magnitude of the difference between the variable's extreme values. In older texts the phase is sometimes called the amplitude.

Time period--A Time period (denoted by 'T' ) is the time needed for one complete cycle of vibration to pass a given point. As the frequency of a wave increases, the time period of the wave decreases. Frequency and time Period are in a reciprocal relationship that can be expressed mathematically as: T = 1/f or as: f = 1/T.
Frequency of a sound wave--Frequency is the speed of the vibration, and this determines the pitch of the sound. It is only useful or meaningful for musical sounds, where there is a strongly regular waveform. Frequency is measured as the number of wave cycles that occur in one second. The unit of frequency measurement is Hertz (Hz for short).