Question

radio waves are used to carry signals because

Answer 1

Radio waves have lower frequencies and longer wavelengths.
They are used to transmit television and radio programmes. Television uses higher frequencies than radio. A radio programme receiver does not need to be directly in view of the transmitter to receive programme signals.

Answer 2

Radio waves that carry signals for both radio and television programs ... Electromagnetic waves used to kill bacteria on hospital equipment and can cause skin to produce Vitamin D.