• # question_answer 20) The period of a satellite in a circular orbit of radius R is T, the period of another satellite in circular orbit of radius 4R is A)  4T           B) T/4C)  8T           D) T/8

$\frac{{{T}_{1}}}{{{T}_{2}}}={{\left( \frac{{{R}_{1}}}{{{R}_{2}}} \right)}^{3/2}}={{\left( \frac{R}{4R} \right)}^{3/2}}\Rightarrow {{T}_{2}}=8{{T}_{1}}$