Satellites used for telecommunication relay are kept in geostationary orbit. A satellite is said to be in such an orbit when ___________.
(1) the orbit is geosynchronous
(2) the orbit is circular
(3) the orbit lies in the plane of the Earth's equator
(4) the orbit is at an altitude of 22236 km
Select the correct answer using the codes given below.

1, 2 and 3

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1, 3 and 4

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2 and 4

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All of the above

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Solution

The correct option is C 1, 2 and 3
A geostationary orbit is a circular geosynchronous orbit in which the satellite is placed at an altitude of approximately 35786 km above mean sea level. The orbit lies in the plane of the Earth's equator. An object in such an orbit has an orbital period equal to earth's rotational period and thus appears motionless.

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A geosynchronous satellite is a satellite that orbits the earth with an orbital period of 24 hours, thus matching the period of the earth's rotational motion. A special class of geosynchronous satellites is a geostationary satellite. A geostationary satellite orbits the earth in 24 hours along an orbital path that is parallel to an imaginary plane drawn through the Earth's equator. Such a satellite appears permanently fixed above the same location on the Earth. If a geostationary satellite wishes to orbit the earth in 24 hours (86400 s), then how high above the earth's surface must it be located? (Given: $M_{e a r t h} = 5.98 \times 10^{24} k g, R_{e a r t h} = 6.37 \times 10^{6} m$ )