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If the human eye can detect light with a radiant energy incident of at least 4x10 to the negative 17 Joules then for light of 600nm wavelength how many photons does this correspond to?
PeppermintPattie89
The energy E of a photon is E= h x f , where f is the frequency, and h is Planck's constant.
h=6.63e-34 [aka 6.63 x 10^-34] J s (Joule-seconds)
The frequency f of a photon is related to its wavelength by
f=speed of light/wavelength
Speed of light c=3e8 m/s.
From this you can calculate the energy of a 600nm photon, and then the number of those photons required to get 4e-17 Joules.
Your answer should be between 50 and 500, but you can do the math.
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∙ 14y ago
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Use the equations E=hf and v=fλ to get your answer
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