Select the true statement regarding amplitude modulation (am). a. an increase in message amplitude, am, results in a higher am index, µam. b. an increase in message amplitude, am, results in an increase in occupied frequency bandwidth. c. as the message frequency increases, the occupied frequency bandwidth decreases. d. over-modulation occurs when the carrier wave amplitude, ac, is greater than the message wave amplitude, am.

A that is . An increase in message amplitude, Am, results in a higher AM Index, µAM

Explanation:

Amplitude Modulation is:

A) An increase in message amplitude, Am, results in a higher AM Index, μAM.  is true statement.

C) As the message frequency increases, the occupied frequency bandwidth decreases is False statement because the reverse happens.

D) Over-modulation occurs when the carrier wave amplitude, Ac, is greater than the message wave amplitude, Am.is also a false statement as over modulation will occur when we cross maximum signal to noise ratio.

it doesn't. it was imagined up in the middle ages.