In an elliptical orbit under gravitational force,in general

The time period of a satellite of the Earth is $5$ hours. If the separation between the Earth and the satellite is increased to four times the previous value,the new time period will become ......... $hours$.

The period of a satellite in a circular orbit of radius $R$ is $T$. The period of another satellite in a circular orbit of radius $4R$ is:

If a body describes a circular motion under an inverse square field,the time taken to complete one revolution $T$ is related to the radius of the circular orbit $r$ as:

In a solar system, the time-period of revolution of a planet tracing a circular orbit of radius $R$ is proportional to :

Which graph best represents the variation of radius $r$ of a circular orbit of a satellite against its time period $T$?