A) Distinguish between frequency modulated and amplitude modulated radio transmitters. b) An RLC circuit with R=100 ohm, L=0.25mH is used to pick up FM radio signals. Calculate its resonant frequency.

9. a) Distinguish between frequency modulated and amplitude modulated radio transmitters.

• Amplitude Modulation (AM): The amplitude of the carrier wave is varied in proportion to the instantaneous amplitude of the modulating signal, while its frequency and phase remain constant.
• Frequency Modulation (FM): The frequency of the carrier wave is varied in proportion to the instantaneous amplitude of the modulating signal, while its amplitude remains constant.

9. b) Figure 4 shows an RLC circuit which may be used to pick up radio signals from a community FM radio.

Given values from Figure 4:
Resistance, $R = 100 \, \Omega$
Inductance, $L = 0.25 , mH = 0