Suppose that, at night, the brightness of a light bulb is measured from a certain distance and then the light bulb is moved to a distance twice as far away. How bright will the light appear compared to the earlier measurement?

Question

Quizplus · Accepted Answer

The brightness of a light follows the inverse square law, meaning that as the distance from a light source doubles, its apparent brightness becomes 1/4 of what it was at the original distance.

Suppose That, at Night, the Brightness of a Light Bulb