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E hf = . fc λ = 1240 eV nm , so 400 nm . 3.1 eV hc hc E hf E

Solution (a) Calculate the wavelength of a photon with energy 3.1 eV. hc hc 1240 eV " nm E = hf = , so ! = = = 400 nm . ! E 3.1 eV (b) Calculate the ...

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