Q. The earth revolves round the sun in one year. If the distance between them becomes double, the new period of revolution will be
A) $1/2\ year$
B) $2\sqrt{2}\ years$
C) $4\ years$
D) $8\ years$
Explanation
(b) $\frac{T_{2}}{T_{1}} = \left( \frac{r_{2}}{r_{1}} \right)^{3/2} = (2)^{3/2} = 2\sqrt{2} \Rightarrow T_{2} = 2\sqrt{2}\ years$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.