Q 12-08-168JEE MainJEE Main 2021 (26 Aug, Shift 1)Easy
An amplitude-modulated wave is represented by $C_m(t) = 10(1 + 0.2\cos12560t)\sin(111\times10^4t)$ V. The modulating frequency in kHz will be
Numerical value type. Enter your answer.
Answer: 2
The modulating signal is $\cos(12560t)$, so $\omega_m = 12560$ rad s$^{-1}$.
$$f_m = \frac{12560}{2\pi} \approx 2000\ \text{Hz} = 2\ \text{kHz}$$
Solution by Sreeraj P, M.Sc Physics