Question

A planet revolves around sun whose mean distance is 1.588 times the mean distance between earth and sun. The revolution time of planet will be

• A. 1.25 years
• B. 1.59 years
• C. 0.89 years
• D. 2 years

Answer 1

Answer: (D)

2 years

Answer 2

$\frac { T _ { \text {plant } } } { T _ { \text {earth } } } = \left( \frac { r _ { \text {plant } } } { r _ { \text {earth } } } \right) ^ { 3 / 2 } = ( 1.588 ) ^ { 3 / 2 } = 2$ ∴