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If a 120-W lightbulb emits 3.5 % of the input energy as visible light (average wavelength...

If a 120-W lightbulb emits 3.5 % of the input energy as visible light (average wavelength 550 nm) uniformly in all directions.

How many photons per second of visible light will strike the pupil (4.0 mm diameter) of the eye of an observer 1.6 m away? Express your answer using two significant figures. ΔN1Δt Δ N 1 Δ t = photons/s SubmitPrevious AnswersRequest Answer Incorrect; Try Again; 5 attempts remaining Part B How many photons per second of visible light will strike the pupil (4.0 mm diameter) of the eye of an observer 1.3 km away? Express your answer using two significant figures. ΔN2Δt Δ N 2 Δ t = nothing photons/s SubmitRequest Answer

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