A 40-W lightbulb is 2.2 m from a screen. What is the intensity of light incident...
A 40-W lightbulb is 2.2 m from a screen. What is the intensity of light incident on the screen? Assume that a lightbulb emits radiation uniformly in all directions (i.e., over 4π steradians).
Homework Answers
formula for intensity
I = P/A
since lightbulb emits radiation uniformly in all directions
A= 4 pi r^2
I = P/ 4pi r^2
=40 W/ 4 pi (2.2)^2
=0.657 W/m^2
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