A-LevelPhysicsAstronomy and cosmologyMay/June 2018Paper 4 Q58 Marks
5 A geostationary satellite orbits the Earth with a period of 24 hours. (a) State (i) the direction of the orbit about the Earth, (ii) the position of the satellite relative to the Earth's surface, (iii) a typical frequency for communication between the satellite and Earth. frequency = .............................................. Hz (b) A signal transmitted from Earth to a satellite has an initial power of 3.0 kW. The signal power received by the satellite is attenuated by 195 dB. (i) Calculate the signal power received by the satellite. power = .............................................. W (ii) By reference to your answer in (i), explain why different frequencies are used for the up-link and the down-link in communication with the satellite.
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