What is a role of electromagnetic waves in communication?

Answer 1

sound waves are pressure waves that can push a thin membrane in a microphone. that membrane is attached to a magnet that moves through a loop of wires called a solenoid. the motion of a magnetic field moving through a solenoid generates an electric current (an electro-magnetic wave)

that signal can be transported down a wire and re-interpreted at another telephone.

Answer 2

That depends on what means of communication you choose.

-- If you choose verbal conversation with someone else in the same room, or

a wired local area telephone call, or jungle drums, or a ram's horn or brass bugle,

or a Greek chorus, town crier, or troubador, or a voice recording on a physical

medium that will be shipped to the other party, then electromagnetic waves have

no part at all in your communication.

-- If you choose to communicate in writing, or in American Sign Language, or with

semaphore or heliostat, or through a coded obituary notice in the local newspaper,

or by hanging lanterns in the belfry, then the other party is certain to use waves of

visible light to decode your message.

-- If you communicate by cellular telephone, or by long-distance wired telephone,

or by walkie-talkie, or over a WiFi connection to the internet, or on TV, then your

communication depends entirely on radio waves.

-- If you communicate with your partner or your family in the form of a hastily-prepared

gourmet dinner, then the efficacy of your message might depend on microwaves.