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If a 80-WW lightbulb emits 3.5 %% of the input energy as visible light (average wavelength...

If a 80-WW lightbulb emits 3.5 %% of the input energy as visible light (average wavelength 550 nm) uniformly in all directions.

Part A

How many photons per second of visible light will strike the pupil (4.0 mmmm diameter) of the eye of an observer 2.5 mm away?

Part B

How many photons per second of visible light will strike the pupil (4.0 mmmm diameter) of the eye of an observer 1.5 kmkm away?

Express your answer using two significant figures.

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Answer #1

Given, Po=sow Pemitted X 80 2:8 W 100 7 = 550 m = 550x109m (a) Givern, diameter 4mm abserver 2-5 m away we horow inter Sa teaThere fore at eyei P= IA P= (0.03565071 ) x (TTX P = 4.48X107 5). Substituting in equi , we get --7 4048810 3.61 x 1019 1.240

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