(a) Define a transverse wave and a longitudinal wave.
(b) With the help of neatly labelled sketches, mark and name any one crest and one trough on a transverse sinusoidal wave, and any one compression and one rarefaction on a longitudinal wave train.
(c) State any two characteristics that clearly distinguish the motion of particles in a transverse wave from that in a longitudinal wave.
(d) Give two common examples of each type of wave found in nature.
(e) State whether either of the two kinds of mechanical waves can propagate through vacuum. Give a brief reason.