The intensity of sunlight hitting the surface of the earth on a cloudy day is about 0.50

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The intensity of sunlight hitting the surface of the earth on a cloudy day is about 0.50 kW/m. Assuming your pupil can close down to a diameter of 2.0 mm and that the average wavelength of visible light is 550 nm, how many photons per second of visible light enter your eye if you look up at the sky on a cloudy day?

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College Physics A Strategic Approach

ISBN: 9780321595492

2nd Edition

Authors: Randall D. Knight, Brian Jones, Stuart Field

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