Geo-stationary satellite is one which

Options

Aremains stationary at a fixed height from the earth's surface
Brevolves like other satellites but in the opposite direction of earth's rotation
Crevolves round the earth at a suitable height with same angular velocity and in the same direction as earth does about its own axis
DNone of these

Correct answer

C. revolves round the earth at a suitable height with same angular velocity and in the same direction as earth does about its own axis

Step-by-step solution

Geo-stationary satellites are also called synchronous satellite. They always remain about the same path on equater, i.e., it has a period of exactly one day

(86400 \mathrm{sec})

So orbit radius

\left(\mathrm{T}=2 \pi \sqrt{\frac{\mathrmr^{3}}{\mathrm{GM}}}\right)

comes out to be

42400 \mathrm{~km}

, which is nearly equal to the circumference of earth. So height of Geostationary satellite from the earth

\text{ surface is }

42,400-6400=36,000

\mathrm{~km} \text{ . }

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