An FM radio station instructs your radio receiver how to move its speaker cone by varying the
A) amount of electric charge it pushes up and down its antenna.
B) amplitude of the radio wave it produces.
C) strength of the electric and magnetic fields in the radio wave it produces.
D) frequency of the radio wave it produces.

Question

Quizplus · Accepted Answer

FM radio works by varying the frequency of the radio waves it transmits, which the receiver then decodes to reproduce sound. This is different from AM radio, which varies the amplitude of the radio waves.

An FM Radio Station Instructs Your Radio Receiver How to Move