Which of the following correctly describes a use of microwaves in communications?

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Question

Which of the following correctly describes a use of microwaves in communications?

Accepted Answer

A. Transmitting signals between satellites and ground stations — Microwaves are used to transmit signals to and from satellites because they pass through the atmosphere with minimal absorption. X-rays are used for bone imaging. Gamma rays or ultraviolet radiation are used for sterilisation. Ultraviolet light is used to detect forged banknotes.

Answer

A. Transmitting signals between satellites and ground stations

Answer

D. Detecting forged banknotes under special lamps

Answer

B. Producing images of bones inside the human body

Answer

C. Sterilising medical equipment in hospitals

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