MCAT Question A Day - 9/9/13 | FreeMCATPrep.com

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MCAT Question A Day - 9/9/13

The human eye can respond to light with a total energy of as little as 10^-18 J. If red light has a wavelength of 600 nm, what is the minimum number of red light photons that the eye can perceive?

A. 1

B. 2

C. 3

D. 5

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