How do the following factors affect, if at all, the speed of sound in air —

(i) frequency of sound
(ii) temperature of air
(iii) pressure of air
(iv) moisture in air?

Describe in brief, with the aid of a labelled diagram, an experiment to demonstrate that a material medium is necessary for the propagation of sound.

Describe an experiment to show that in wave motion, only energy is transferred, but particles of medium do not leave their positions.

Describe a simple experiment which demonstrates that the sound produced by a tuning fork is due to vibration of it's arms.