Introduction sound

Imagination of world without sound would be a mixed feeling of horror and fun.

Every day we hear sounds from various sources like humans, birds, bells, machines, vehicles, televisions, radios, etc.

The study of sound is largely based on the classical contribution of Helmlroltz and Lord Reyleigh. However, the significance of sound in human communication has grown rapidly with developments in radio, television and recorded speech and music.To score More in your class 9 refer NCERT solutions for class 9