Question

Sinusoidal carrier voltage of frequency `1.5 MHz` and amplitude `50V` is amplitude modulated by sinusoidal voltage of frequency `10kHz` producing `50%` modualtion. The lower and upper side-band frequencies in `kHz` are
A. `1490, 1510`
B. `1510, 1490`
C. `(1)/(1490),(1)/(1510)`
D. `(1)/(1510),(1)/(1490)`

Answer 1

Correct Answer - a
Here, `f_(c)=1.5MHz=1500kHz, f_(m)=10kHz`
`:.` Low side band frequency
`=f_(c)-f_(m)=1500kHz-10kHz=1490kHz`
Upper side band frequency
`=f_(c)+f_(m)=1500kHz+10kHz=1510kHz`