The period of revolution of planet A round from the sun is 8 times that of B. The distance of A from the sun is how many times greater then tht of B from the sun ?

Options

A. 2
B. 3
C. 4
D. 5

Answer

c

Explanation

`T^(2)propR^(3)" "therefore (T_(1)^(2))/(T_(2)^(2))=(R_(1)^(3))/(R_(2)^(3))`
`therefore " "(R_(1)^(3))/(R_(2)^(3))=64" "therefore" "R_(1)=4R_(2)`