The intensity of sunlight per square meter reaching Jupiter is approximately what fraction of that at Earth's orbital distance? (Jupiter's orbit has a semimajor axis of about 5 au.)
A) 25 times
B) about the same
C) 1/5
D) 1/25

Question

Quizplus · Accepted Answer

The intensity of sunlight decreases with the square of the distance from the Sun. Since Jupiter is about 5 astronomical units (au) from the Sun, the intensity of sunlight it receives is $1/5^2 = 1/25$ of what Earth receives.

The Intensity of Sunlight Per Square Meter Reaching Jupiter Is