Question

Light takes approximately 8 minutes to reach the earth from Sun. The distance between earth and Sun in kilometers is ______. (speed of light= 3$\times$ 10${}^8$ ms${}^{-1}$ )

• A. 1440 $\times$ 10${}^8$ m
• B. 14 $\times$ 10${}^8$ m
• C. 140 $\times$ 10${}^8$ m
• D. 4 $\times$ 10${}^8$ m

Answer 1

The correct option is A 1440 $\times$ 10${}^8$ m

The distance between the earth and the sun $d=$ velocity of light $\times$ time taken to reachlight form sun to earth

or $d=(3\times {10}^{8}m/s)\times (8\times 60s)=144\times {10}^{9}m=144\times {10}^{6}km$