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?
1 answer
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.
1 answer