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

Electromagnetic waves are used to transmit information in the form of radio, TV, cell phone, and wifi signals. These waves can travel long distances through air or space, and their properties allow for efficient and reliable communication between different devices. The ability to modulate these waves with information allows us to send and receive data quickly and wirelessly.

Answer 3

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.