Final answer:
Amplitude modulation (AM) is a method used to place information on electromagnetic waves by modulating the amplitude of a carrier wave with an audio signal. This process results in a wave with a constant frequency but varying amplitude.
Step-by-step explanation:
Amplitude modulation (AM) is a method used to place information on electromagnetic waves by modulating the amplitude of a carrier wave with an audio signal. This process results in a wave with a constant frequency but varying amplitude. To understand this concept, imagine a radio station transmitting speech or music. The audio signal is used to modulate the amplitude of the carrier wave, which allows the information to be encoded into the wave. The demodulation process in the receiver then separates the information from the carrier wave, allowing us to hear the sound.