**Satellites orbiting the earth have finite life and sometimes debris of satellites fall to the … decrease (d) of collisions with other…**

###### Answers:

(c) We know that the total energy of the earth satellite of radius R bounded system is negative

(-GM\ 2 R)

where Mis mass of the earth. –

Due to the atmospheric friction (viscous force) acting on satellite, energy decreases continuously, radius of the orbit or height decreases gradually and the satellite spirals down with increasing speed till it bums in the denser layers of the atmosphere.