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How many photons per second of visible light will strike the pupil (4.0 mm diameter) of the eye of an observer 1.0 m away?


If a 120-W lightbulb emits 25% 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 mm diameter) of the eye of an observer 1.0 m away?

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