Signal Modulation
An FM radio station broadcasts a weak message signal of low frequency by modulating (mixing) it with a high-frequency carrier wave. In modulation, the frequency of the carrier is made proportional to the amplitude of the message wave. This increases not only the strength of the signal but also the distance of broadcast.
The first image above shows the carrier wave, and the second the message signal.
Which of the following shows how the modulated wave will look like?
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