What is the number of photons of light with wavelength 4000 pm which provide 1 Joule of energy?
What is the number of photons of light with wavelength 4000 pm which provide 1 Joule of energy?
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1 Answer
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Given: h = 6.626 × 10-34 Js,
c = 3 × 108 m s-1,
λ = 4000 pm = 4000 × 10-12 m = 4 × 10-9 m
Energy of photon (E) = hc / λ
= (6.626 × 10-34 Js) x (3 × 108 m s-1) / (4 × 10-9 m) = 4.969 x 10-17 J
i.e. 4.969 x 10-17 J is the energy of 1 photon
Therefore, 1 J is the energy of photons = 1 / (4.969 x 10-17) = 2.012 x 1016 photons.
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