Explain why, the flash of a gun shot reaches us before the sound of the gun shot.

A cricket ball is seen to hit the bat first and the sound of hitting is heard a little later. Why?

Explain why, the flash of lightning reaches us first and the sound of thunder is heard a little later.

Which of the following terms apply to sound waves in air and which to water waves?

Transverse, Rarefaction, Trough, Crest, Compression, Longitudinal

Name four ways in which sound can be produced.