Question

mention the laws of sound?

Answer 1

the persistence of hearing is 0.1s
sound is produced by a vibrating body
sound needs a material medium for propagation
sound undergoes reflection too

Answer 2

The following are the laws of sound..

•The sound waves that travel towards the reflecting surface are called the incident sound waves.

•The sound waves bouncing back from the reflecting surface are called reflected sound waves.

•For all practical purposes, the point of incidence and the point of reflection are the same point on the reflecting surface.

hope this helps!
cheers! (: