Discussion
A tone of \( 1 \ \mathrm{kHz} \) modulates a \( 100 \ \mathrm{kHz} \) carrier in a balanced modulator. The output contains
Answer: A
The balanced modulator cancels the carrier and leaves the sum and difference:
\[ 100 \pm 1 = 99 \ \mathrm{and} \ 101 \ \mathrm{kHz} \]
so 99 and 101 kHz with nothing at 100 kHz. The second option is what a plain amplifier would pass. The third describes full-carrier AM, where the carrier survives. And the last lists the message and carrier frequencies rather than the products, which is the baseband view rather than the passband one.
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