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25.60 Energy

You are standing 2.2m from a 110-W lightbulb.

A. If the pupil of your eye is a circle 5.0mm in diameter, how much energy enters your eye per second? (Assume that 5.0% of the lightbulb's power is converted tolight.)

E=___uJ

B. Repeat part A for the case of a 1.0mm--diameter laser beam with a power of 0.40mW .

E=___uJ

Answer using two significant figures please.
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Homework Answers

Answer #1
A) 110*0.05*( 0.005/2.2)^2 J= 28.4 uJ
B) 0.4*0.001 J = 400 uJ
answered by: Ningi
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Answer #2
1.28.41 uJ
2.8.2644*10^(-11) J
answered by: Shantisha
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Answer #3
1.28.41 uJ
2.4.1322*10^(-12) J
answered by: DL
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