Q. In AM, the centpercent modulation is achieved when
A) Carrier amplitude $=$ signal amplitude
B) Carrier amplitude $\neq$ signal amplitude
C) Carrier frequency $=$ signal frequency
D) Carrier frequency $\neq$ signal frequency
Explanation
(a) When signal amplitude is equal to the carrier amplitude, the amplitude of carrier wave varies between $2A$ and zero
$m_{a} = \frac{Amplitude\ of\ charge\ carrier}{Amplitude\ of\ normal\ carrier} = \frac{2A - A}{A} \times 100 = 100\%$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.