(a(i))[2]
State the meaning of an amplitude-modulated (AM) wave.
(a(ii))[2]
Give two reasons for modulating the transmitted wave instead of sending the information signal directly as a radio wave.
(b)
The way the amplitude $A$ of the transmitted wave depends on frequency $f$ is shown in Fig. 11.1. For this transmission, determine (i) the wavelength of the carrier wave, (ii) the bandwidth, (iii) the maximum frequency, in Hz, of the transmitted audio signal.
(b(i))[2]
Determine the carrier-wave wavelength.
(b(ii))[1]
Determine the bandwidth from the graph.
(b(iii))[1]
Determine the maximum frequency, in Hz, of the transmitted audio signal.