(a(i))[3]
Fill in the second column of Table 5.1 with the electromagnetic spectrum region used for each application.
(a(ii))[1]
State the approximate speed that radio waves have in air.
(b(i))[2]
On Fig. 5.1, draw three successive crests before the wave reaches the gap.
(b(ii))[2]
On Fig. 5.2, draw three successive crests of the wave after it has passed through the gap.