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Satellites orbiting the earth have finit...

Satellites orbiting the earth have finite life and sometimes debris of satellites fall to the earth. This is because 

A

the solar cells and batteries in satellites run out

B

the laws of gravitation predict a trajectory spiralling inwards

C

of viscous forces causing the speed of satellite and hence height to gradually decrease

D

of collisions with other satellites

Text Solution

Verified by Experts

The correct Answer is:
C
The total energy of the earth satellite is negative as it is bounded.
Due to the viscous force acting on satellite, energy decreases continuously and radius of the orbit or height decreases gradually.
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