Question

the diagram shows a carrier wave before and after modulation. the diagram best represents which type of modulation? before modulation after modulation fm phase am pulse

Explanation:

AM (Amplitude - Modulation) changes the amplitude of the carrier wave. In the given diagrams, the amplitude of the wave changes after modulation while the frequency and phase remain relatively constant. FM changes the frequency, phase - modulation changes the phase, and pulse - modulation has discrete pulses. Since the amplitude is varying here, it represents AM.

Answer:

AM