### Home > APCALC > Chapter 11 > Lesson 11.4.1 > Problem 11-115

11-115.

**Multiple Choice: **The luminous intensity * *of a light bulb, measured in lumens/ft

^{2}, varies inversely as the square of the distance

*from the bulb.*

*lumens/ft*

^{2}when

*for a*

lumens/ft ^{2 }

lumens/ft ^{2 }

lumens/ft ^{2 }

lumens/ft ^{2 }

lumens/ft ^{2 }

When ?

Substitute in the known values and solve for *E′*.