Which of the following is a property of microwaves used in communication?

They are refracted by the ionosphere.

They require large aerials for transmission.

They are not absorbed by the atmosphere.

They are reflected by metal walls.

Why are geostationary satellites ideal for radio and telecommunication broadcasting worldwide?

They are positioned at a higher altitude than polar satellites.

They orbit above the Earth's equator.

They complete their orbit in 24 hours.

They offer shorter signal delays compared to polar orbits.

What is the main risk associated with high-frequency electromagnetic waves such as gamma rays?

Ionization and potential cancer

Which type of signal can only be in one of two discrete states?

Both analogue and digital signals

What advantage does digital signalling have over analogue signalling?

Less capacity for error checking

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