Answer the following:

How does the speed of sound differ in different media?

Flash of lightning reaches us earlier than the sound of thunder. Explain the reason.

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

State three characteristics of the medium required for propagation of sound?