Discussion
A carrier at \( 1000 \ \mathrm{kHz} \) is modulated by a \( 5 \ \mathrm{kHz} \) tone. The sidebands lie at
Answer: C
The sidebands sit at the sum and difference frequencies:
\[ f_c \pm f_m = 1000 \pm 5 \ \mathrm{kHz} \]
so 995 and 1005 kHz, with the carrier still present between them. The second option gives only the upper sideband and the carrier. 990 and 1010 kHz would follow from a ten kilohertz tone. And the last option lists the message and carrier frequencies rather than the sidebands, which is a confusion between the baseband and passband descriptions.
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