Sound


   
 
Introduction
You have learnt that sound is a form of energy. It is produced by vibrations. Sound waves are longitudinal waves. They are also elastic waves hence they need a material medium for their transmission. They can not be transmitted in vacuum. They travel in solids, liquids and gases. Their velocity is maximum in solids and least in gases.
 
We hear various kinds of sound in our daily life, pleasant sounds called the musical sounds, unpleasant sound called the noise, loud sound, high pitched sound etc.
 
In this chapter let us study the difference between pleasant and unpleasant sound and the factors on which the loudness, pitch etc depend upon.
 
 
     
   
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