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**Unformatted text preview: **E photon = Î” E = -13.6eV( (1/3)^2 â€“ (1/7)^2) = 1.23eV and Î» = hc/ E photon = 1240 eV nm/1.23 eV = 1008 nm ~ 1010nm (not sure whatâ€™s up with the rounding in the answer key) b) The momentum of photon is p = h/ Î» momenum is conserved, so momenum of atom is p = m v where m=1.67e-27 kg (proton mass) We have v = h/(m Î» ) = (6.626e-34 J s)/((1.67e-27kg)*(1.01e-6m)) = 3.95e-1 m/s...

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