Physics

The characteristics of sound by which we can differentiate the sound produced from the different musical instrument is called timber or quality of sound.

The wavelength can be defined as the distance between two successive crests or troughs of a wave.

If a beam of rays, after being reflected from or refracted through a surface either meet at or appears to diverge from a second point is called the image of the first point.

The sound which is created due to regular and periodic vibration of the source and which are melodious to us is known as musical sound.

The maximum displacement of a particle in a wave from the equilibrium to any direction is called amplitude.

If the frequency of sound is less than 20 Hz it is called infrasonic sound.

A time period is a time needed for one complete cycle of vibration to pass at a given point.

The overall condition of motion of a wave at any moment in time is known as its phase.