The waves used by artificial satellite for communication purposes are
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Microwaves
A signal sent to a satellite has to pass through the ionosphere and travel in a straight line to the satellite and back. Microwaves (frequencies of a few GHz) do this: they are not reflected by the ionosphere and can be sent as a narrow beam, so they are used for satellite communication.