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

Transverse, Rarefaction, Trough, Crest, Compression, Longitudinal

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

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

Name four ways in which sound can be produced.

Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.