In a radio, frequency modulation refers to encoding a wave with information by:
a) adjusting the height of the waves
b) adjusting how many waves are produced per second
c) turning the wave on and off
d) changing the medium in which the waves travel
In radio communication, "frequency modulation" refers to encoding a wave with information by adjusting how many waves are produced per second. (b) That's the "frequency" of the radio carrier signal.
