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  4. In amplitude modulation, sinusoidal carrier frequency used is denoted by ωc and the signal frequency is denoted by ωm. The bandwidth (Δ ωm) of the signal is such that Δ ωm < < ωc. Which of the following frequencies is not contained in the modulated wave ?

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Q. In amplitude modulation, sinusoidal carrier frequency used is denoted by $\omega_c$ and the signal frequency is denoted by $\omega_{m}$. The bandwidth $(\Delta \omega_{m}) $of the signal is such that $\Delta \omega_{m} < < \omega_{c}$. Which of the following frequencies is not contained in the modulated wave ?

JEE MainJEE Main 2017Communication Systems

Solution:

Modulated wave has frequency range
$\omega_{c} \pm \omega_{m}$
$\therefore $ Since $\omega_{c} > > \omega_{m}$
$\therefore \, \, \omega_{m} $ is excluded.