An audio signal of amplitude 2.0 µV and frequency 4.2kHz is to be transmitted using a carrier wave of amplitude 10.0mV and frequency 100kHz. Either amplitude modulation or frequency modulation may be used. The amplitude modulation is at a rate of 1 mV µV⁻¹. The frequency modulation is at a rate of 5 kHz µV⁻¹. Complete Table 5.1 to show the maximum and minimum values of the amplitude and of the frequency of the modulated wave for each type of modulation. Table 5.1 amplitude/mV frequency/kHz minimum maximum minimum maximum amplitude modulation frequency modulation

1. (a)(i)When audio signals are transmitted over long distances, modulation of radio waves is used. Suggest a reason why modulation is used.[1]
2. (a)(ii)State a technical advantage and a technical disadvantage of using frequency modulation rather than amplitude modulation. advantage: disadvantage:[2]
3. (b)An audio signal of amplitude 2.0 µV and frequency 4.2kHz is to be transmitted using a carrier wave of amplitude 10.0mV and frequency 100kHz. Either amplitude modulation or frequency modulation may be used. The amplitude modulation is at a rate of 1 mV µV⁻¹. The frequency modulation is at a rate of 5 kHz µV⁻¹. Complete Table 5.1 to show the maximum and minimum values of the amplitude and of the frequency of the modulated wave for each type of modulation. Table 5.1 amplitude/mV frequency/kHz minimum maximum minimum maximum amplitude modulation frequency modulation[4]
4. (c)For the amplitude modulated wave in (b), determine the bandwidth.[1]