For a 225- watt bulb, the intensity I of light, in lumens at a distance of x feet is I = 225/x^2.

a. What is the intensity of light 5 ft from the bulb?
b. Suppose your distance from the bulb doubles. How does the intensity of the light change? Explain.

Question

For a 225- watt bulb, the intensity I of  light, in lumens at a distance of x feet is I = 225/x^2.

a. What is the intensity of light 5 ft from the bulb?
b. Suppose your distance from the bulb doubles. How does the intensity of the light change? Explain.

espex · Answer

This is a simple plug and chug, they have given you the equation and all you need do is plug in 'x'.