According to the inverse-square law, if the distance to a lightbulb increases by a factor of 5, the bulb's apparent brightness
A) Stays the same
B) Becomes 5 times less
C) Becomes 10 times less
D) Becomes 25 times less
Answer: D
According to the inverse-square law, if the distance to a lightbulb increases by a factor of 5, the bulb's apparent brightness
A) Stays the same
B) Becomes 5 times less
C) Becomes 10 times less
D) Becomes 25 times less
Answer: D