Question

The length of a year on any planet is defined as the time interval the planet takes to make one revolution around the Sun. What is the length of a year on a planet whose orbital radius is four times Earth’s orbital radius?
1 : 1 Earth year
2 : 2 Earth years
3 : 4 Earth years
4 : 8 Earth years
5 : 0.5 Earth years
6 : 0.25 Earth years
7 : 0.125 Earth years

Answer 1

3. 4 Earth years.