During a school demonstration, a teacher first flicks one end of a stretched rope up and down and then compresses and releases a long, loosely held slinky along its length.
(i) Identify which of the two demonstrations produces a transverse wave and which produces a longitudinal wave.
(ii) Explain, on the basis of particle motion relative to the direction of propagation, why the two waves are classified differently.
(iii) Using similar reasoning, explain clearly why sound in air cannot be a transverse wave.