Answer to Question 5

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Change in energy = 1.02 - 0.83 = 0.19 MeV = 0.19 106 eV

Change in energy = 0.19 106 1.6 10-19 = 3.04 10-14 J

l = hc E = (6.63 10-34 3 108) 3.04 10-14 = 6.5 10-12 m