(a(i))[2]
State the meaning of amplitude modulation (AM) of a radio wave.
(a(ii))[2]
State two advantages of AM transmissions over frequency modulation (FM) transmissions.
(b)
The way amplitude $A$ changes with frequency $f$ for a transmitted radio wave after amplitude modulation by an audio signal is shown in Fig. 5.1.
(b(i))[1]
Determine the wavelength of the carrier wave for this transmission.
(b(ii))[1]
Determine the maximum frequency of the transmitted audio signal for this transmission.
(c)[1]
A second audio signal with the same maximum frequency is sent using a different carrier frequency. The lowest frequency of this modulated wave matches the highest frequency of the modulated wave in (b). Find this carrier frequency.