A) 18 R
B) 10 R
C) 7R
D) 5R
Correct Answer: C
Solution :
Key Idea: Geostationary satellites are positioned at an exact height above the earth (above 35600 km). The distance of geostationary satellite from centre of earth is \[({{R}_{e}}+35600)\,km\,=6400+35600\] \[=42000\,\text{km}\] At this height they rotate around the earth with the same speed as the earth rotates around its axis. So, its effect remains stationary above a point on earth. \[\therefore \] \[42000=6400\times R\] \[\Rightarrow \] \[R=\frac{42000}{6400}\approx 7R\]You need to login to perform this action.
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