8. the time period of artificial satellite in a circular orbit of radius r is t. the radius of the orbit in which time period is 8t is: (b) 3r

Explanation:

It is given that,

The time period of artificial satellite in a circular orbit of radius R is T. The relation between the time period and the radius is given by :

The radius of the orbit in which time period is 8T is R'. So, the relation is given by :

So, the radius of the orbit in which time period is 8T is 4R. Hence, this is the required solution.