Q. Sinusoidal carrier voltage of frequency $1.5\ MHz$ and amplitude $50\ V$ is amplitude modulated by sinusoidal voltage of frequency $10\ kHz$ producing 50% modulation. The lower and upper side-band frequencies in $kHz$ are
A) 1490, 1510
B) 1510, 1490
C) $\frac{1}{1490},\frac{1}{1510}$
D) $\frac{1}{1510},\frac{1}{1490}$
Explanation
(a) Here, $f_{c} = 1.5\ MHz = 1500\ kHz,\ f_{m} = 10\ kHz$
$\therefore$ Low side band frequency
$= f_{c} - f_{m} = 1500\ kHz - 10\ kHz = 1490\ kHz$
Upper side band frequency
$= f_{c} + f_{m} = 1500\ kHz + 10\ kHz = 1510\ kHz$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.