After completion of this lesson, student must be able to:

  • Explain the nature of a sound wave.
  • Identify infrasound, audible sound, ultrasound wave and their sources.
  • Define reflection of sound with the example.
  • Demonstrate intensity and pitch of the sound.
  • Determine the speed of sound and give an account of the effect of sound in the environment.
  • Explain the causes and effect of sound pollution.
  • Suggest the method of reducing sound pollution.



Sound is the form of energy, which is produced by vibration of molecules of a body. Sound travels in the form of a wave. Mechanical waves can be propagated only in material medium whereas electromagnetic waves do not require any material medium for propagation. This note provides us the information about sound and its propagation as wave.

Reflection and Refraction of Sound

The repetition of sound, which is reflected from walls of large room or distant surface is called echo. This note provides us the information about reflection of sound and sound pollution.

Some Terms Related with Waves

One crest and one trough constitute one complete wave in a transverse wave. Longitudinal wave travels in the form of compression and rarefaction. This note provide us the basic idea about wave and its types.

Some Term Related With Sound

A sound is a form of energy which gives a sensation of hearing. This note provides information about and its properties.

Sound and its Properties

Sound is produced due to the vibration of the body. This note provides information about sound and its properties and factors affecting the velocity of sound.