How does the brightness of an object vary with distance from the object?
A)It remains constant with varying distance
B)It varies as the inverse of distance
C)It decreases as the square of distance
D)It decreases as the cube of distance

Question

Quizplus · Accepted Answer

The brightness of an object decreases as the square of distance, according to the inverse square law. This means that if you double the distance from the object, the brightness decreases by a factor of four. If you triple the distance, the brightness decreases by a factor of nine, and so on. This is why stars appear dimmer when they are further away from us, even if they are still very bright objects.

How Does the Brightness of an Object Vary with Distance