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E=h*c/λ
E=6,63*10⁻³⁴Js*3*10⁸m/s/4*10⁻⁷m=4,97*10⁻¹⁹J=3,1eV
1eV=1,6*10⁻¹⁹J
jeżeli masz jakieś pytania, prv :)