A student makes the following statements about sound travelling from a loudspeaker to a listener at rest in air:
(a) (a) "The air just in front of the loudspeaker gradually drifts toward the listener."
(b) (b) "Molecules of air move forward along with the compression regions."
(c) (c) "The speed of individual air molecules is the same as the speed of the sound wave."
(d) (d) "Energy reaches the listener without any net transport of air."
(e) (i) For each statement (a)–(d), identify whether it is correct or incorrect.
(f) (ii) For every incorrect statement, supply a corrected version and give a brief reason based on the nature of longitudinal waves.
(g) (iii) Using your corrections, distinguish clearly between particle velocity and wave velocity for sound in air.