FCC GROL Element 8 Practice Test 2025 - Free GROL Element 8 Practice Questions and Study Guide

Frequency modulation is the correct answer because it is the primary method used in FM (Frequency Modulation) radio broadcasts. In this type of modulation, the frequency of the carrier wave is varied in accordance with the amplitude of the input signal, such as audio from music or speech. This allows for a clearer and more robust transmission of audio signals over longer distances while being less susceptible to noise and interference compared to other modulation types.

Amplitude modulation, while significant in its own right (notably in AM radio), varies the amplitude of the carrier wave rather than its frequency, making it less suitable for the quality of sound desired in FM broadcasts. Phase modulation, a technique closely related to frequency modulation, can also be utilized but is not the primary method used in FM radio. Pulse modulation is used in different contexts, primarily in digital communication systems, and does not pertain to traditional FM radio broadcasting.