Answers

2016-02-24T21:27:47+05:30
Sound is a vibration that propagates as a typically audible mechanical wave of pressure and displacement,through a medium such as air or water. 
1 1 1
2016-02-24T21:29:38+05:30
Sound is a form of energy which produces sensation of hearing.sound is useful to us by using some products like sonar
1 1 1