Suppose that a 100-W source radiates light of wavelength 600 nm uniformly in all directions and that
Question:
Suppose that a 100-W source radiates light of wavelength 600 nm uniformly in all directions and that the eye can detect this light if only 20 photons per second enter a dark-adapted eye having a pupil 7 mm in diameter. How far from the source can the light be detected under these rather extreme conditions?
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At a distance R from the source the fraction of the light ...View the full answer
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Related Book For 
Fundamentals of Ethics for Scientists and Engineers
ISBN: 978-0195134889
1st Edition
Authors: Edmund G. Seebauer, Robert L. Barry
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