What does "AM" stand for in broadcasting?

In broadcasting, "AM" stands for Amplitude Modulation. This term describes a technique used primarily in radio broadcasting where the amplitude, or strength, of a carrier wave is varied in relation to the information signal being sent, such as voice or music. By modulating the amplitude of the wave, the information can be transmitted over long distances, making AM radio a fundamental method of communication in the medium wave band.

This method is particularly useful for its simplicity and ability to cover a wide area, as AM signals can travel farther than other modulation techniques, especially during nighttime due to atmospheric conditions. Understanding Amplitude Modulation is crucial for anyone involved in broadcasting or radio operation, as it forms the basis for how traditional radio transmissions are made.

The other options, while related to sound and signals, do not accurately represent the standard terminology used in radio broadcasting, thereby making them unsuitable choices in this context.