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OpenStudy (anonymous):
The cone cells of the human eye are sensitive to three wavelength ranges, which the eyes interprets as blue (419 nm), green (531) and red (558 nm). If the optic nerve in the eye requires 2.0 x 10^-17 J of energy to initiate the sight impulses to the brain, how many photons of blue light (419 nm), green light (531 nm), and red light (558 nm) are needed to see those colors?
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