Complete the following sentences —

(a) Sound cannot travel through …………… ; it requires a ……………

(b) When sound travels in a medium, the particles of medium …………… but the disturbance……………

(c) A longitudinal wave is composed of compression and ……………

(d) A transverse wave is composed of crest and ……………

(e) Wave velocity = …………… x wavelength

(a) Sound cannot travel through vacuum ; it requires a medium.

(b) When sound travels in a medium, the particles of medium do not move but the disturbance moves ahead.

(c) A longitudinal wave is composed of compression and rarefaction.

(d) A transverse wave is composed of crest and trough.

(e) Wave velocity = frequency x wavelength.