Question

Anyone can give me key points of propagation and production of sound

Answer 1

THIS MAY HELP YOU.......

Answer 2

Propagation of sounds ::When an objects vibrates and make sounds then the air layers around it also start vibrating in exactly the same way and carry sound waves from the sound producing objects to our eyes.
Production of sounds ::Sound is produced due to the vibration of objects.Vibration is the rapid to and fro motion of an object.