For a satellite to be geostationary, which of the following are essential conditions?:

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It must always be stationary above the equator

It must be rotate from west to east

It must be about 3600 km above the earth surface

Its orbit must be circular, and not elliptical

answer is A.

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Detailed Solution

Concept: Geostationary satellites are used for communication and observation. Geostationary satellites are used to observe parts of the earth and obtain useful information.
Communication related to small mobile phones cannot be done via geostationary satellites, but geostationary satellites are useful for both wireless communication and television broadcasting. Geostationary satellites look like stationary objects from the earth because their movements are almost like the earth. Since the geostationary satellite has zero relative rotation to the earth, it takes 24 hours to complete the rotation. Since the earth rotates from west to east, geostationary satellites also rotate from west to east. The orbit of a geostationary satellite from Earth is approximately 36000 km, and its orbit must be circular.
Hence, the correct option is 1,2,3,4

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