Asked by Anonymous

The retina of a human eye can detect light when radiant energy incident on it is at least 4.0x10^(-17)J. For light of 535nm (5.35x10^(-7) m) wavelength, how many PHOTONS does this energy correspond to?
Answered by DrBob222
E = hc/wavelength. Solve for energy of the 535 nm light. Then set up a proportion between what that is for 1 photon and the number of photons to reach the minimum energy.
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