What is the length of a one-dimensional box in which an electron in the n =1 state has the same energy as a photon with a wavelength of 400 nm?
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since the wavelength of photon is 400×10^-9m
it's energy=(6.626×10^-34)×3×10^8×1/400×10^-9
=6.626×10^-17×3/400
=6.626×3×10^-17×1/400
=1.65×3×10^-19
=4.95×10^-19Nm
also,this is equal to the energy of electron in n=1 state
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