How are amplitude modulation and frequency modulation techniques similar? Both are used by cell phones to produce images.
Both transform electrical signals into sound waves.
Both modify the pulse of a carrier wave.
Both are used by radio stations to transmit sound.

D. Both are used by radio stations to transmit sound

Explanation:

The main difference between both modulations is that in frequency modulation, the frequency of the carrier wave is modified as per the transmit data, while in amplitude modulation, the carrier wave is modified according to the data. because of this it can NOT be A, B, or C but it CAN be D

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answer seismograph;