Light,leaving a point source,spreads out so that the apparent brightness,b,of light per unit area varies with distance d according to which law ($\alpha$ means "proportional to")? A) b $\alpha$ 1/d². B) b = constant. C) b $\alpha$ 1/d. D) b $\alpha$ d².

Question

Quizplus · Accepted Answer

The apparent brightness of light from a point source decreases with the square of the distance from the source, following the inverse square law, which is represented as $b \propto \frac{1}{d^2}$.

Light,leaving a Point Source,spreads Out So That the Apparent Brightness,b,of α\alphaα

Light,leaving a Point Source,spreads Out So That the Apparent Brightness,b,of $\alpha$