Cellular telephone service, television, garage-door openers, toy walkie-talkies, RC model airplanes and boats, taxi communication, ambulance communication, police communication, fire communication, cordless telephones, wireless headphones, 'microwave' ovens, and Bluetooth stuff, all radio waves to transmit and receive their signals.
None of these use 'microwaves' ... not even 'microwave' ovens. 'Microwave' is a label for radio at frequencies above 3 GHz, and none of these things operate at frequencies that high. Bluetooth and microwave ovens operate around 2.45 GHz.
Wi-Fi has one set of channels around 2.4 GHz ... radio waves but not microwaves. Wi-Fi also has another set of channels around 5 GHz ... radio waves that can properly also be called 'microwaves'.
Some TV remotes use infrared waves to communicate with the TV set.
We don't (yet ?) manufacture anything that uses ultraviolet rays, X-rays, or gamma rays for communication. Even if we knew how, these forms of radiation are too dangerous to go shining them around all over the place where people are.
Answer:
Explanation:
Wi-Fi is inside the range of radio waves range in the electromagnetic spectrum, just like cellphones and televisions. Basically, this radio waves are the ones that carry all the information through out wifi, just like cellphones calls or messages.
So, basically, radio waves are the medium to transmit signals and data that we call Wi-Fi.
Therefore, the answer is A.
