The orbital distances of Venus and Jupiter are 0.7 AU and 5 AU,respectively.About how many times brighter is the sun viewed from Venus's distance than from Jupiter's distance?
A)7
B)14
C)50
D)10

Question

Quizplus · Accepted Answer

The brightness of the Sun is inversely proportional to the square of the distance from it. Therefore, the ratio of the brightness of the Sun viewed from Venus to that viewed from Jupiter is (5/0.7)^2 = 51.02. Roundings suggest that the answer is approximately 50, which matches choice C.

The Orbital Distances of Venus and Jupiter Are 0