In an amplitude modulator circuit

PHYSICS · Single correct · A Level · Physics · Electronics · Electronics

Problem

In an amplitude modulator circuit, the carrier wave is given by

C(t) = 4 \sin (20000 \pi t)

while the modulating signal is given by

m(t) = 2 \sin (2000 \pi t)

. Find the modulation index and the lower side band frequency. (1) 0.5 and 10 kHz (2) 0.4 and 10 kHz (3) 0.3 and 9 kHz (4) 0.5 and 9 kHz