A message signal of frequency $14 \mathrm{kHz}$ is used to modulate a carrier of frequency $900…

A message signal of frequency $14 \mathrm{kHz}$ is used to modulate a carrier of frequency $900 \mathrm{kHz}$, then the frequencies of side bands are
  1. $907 \mathrm{kHz}, 893 \mathrm{kHz}$
  2. $920 \mathrm{kHz}, 880 \mathrm{kHz}$
  3. $914 \mathrm{kHz}, 886 \mathrm{kHz}$
  4. $900 \mathrm{kHz}, 914 \mathrm{kHz}$

Solution

$\begin{aligned} & \text { } f_m=14 \mathrm{kHz} ; f_c=900 \mathrm{kHz} \\ & f_c+f_m=914 \mathrm{~Hz} \\ & f_c-f_m=886 \mathrm{~Hz}\end{aligned}$

Asked in: AP EAMCET 2023 (19 May Shift 1)

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