Explain the term ‘amplitude’ of a wave. Draw the diagram of a wave and mark its amplitude on it.

Fill in the following blanks with suitable words

(a) Sound is caused by ………….

(b) A sound wave consists of places of higher pressure called ….. and places of …….. pressure called …………

(c) Wave speed in metres per second equals frequency in …………. Multiplied by ……….. in ………

(d) Sound cannot travel through ……….

(e) The speed of sound in a solid is ………… than the speed of sound in air.

(f) When the frequency of the sound is increased, the wavelength …………

What is vaccum? Explain why, sound cannot travel through vacuum?

Distinguish between longitudinal and transverse waves.

Are sound waves longitudinal or transverse?