Which of the following does not make use of electromagnetic waves in its operation?
Electromagnetic waves are in essence light… Television emits light….it makes use of em waves… Microphones convert sound from your mouth into electricity through the wire and back into sound in a speaker. IT DOES NOT MAKE USE OF EM WAVES! The radio receives a form of EM waves, Radio waves…a kind of light that you cannot see. It makes use of em waves… The torchlight, similar to the Television, emits light/em waves. Thus the answer is B. The microphone.
