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the human eye is able to detect as little as 2.35×10−18 j of green light of wavelength 510 nm. calculate the minimum number of photons of green light that can be detected by the human eye.

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The minimum number of photons of green light that can be detected by the human eye is 6.

Given that;

E = nhc/λ

E = energy of the photon = [tex]2.35 * 10^-18[/tex] J

n = number of photons = ?

h = Planks constant = [tex]6.6 * 10^-34[/tex] Js

c = speed of light = [tex]3 * 10^8[/tex] m/s

λ = [tex]510 * 10^-9[/tex] m

Making number of photons the subject of the formula;

n =[tex]2.35 * 10^-18 * 510 * 10^-9 / 6.6 * 10^-34 * 3 * 10^8[/tex]

n = 6 photons

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