Electronic Structure of Atoms

22) E = 4.41 x 10^-19 J          h = 6.63 x 10^-34 J•s             

       c = 3.00 x 10⁸ m/s

      (a) E = hf

            f = E/h = 4.41 x 10^-19 J/(6.63 x 10^-34 J•s) = 6.65 x 10¹⁴ s^-1

      (b) c = f * wlength

            wlength = 3.00 x 10⁸ m/s/(6.65 x 10¹⁴ /s) = 4.51 x 10^-7 m

      (c) wlength = 439 nm

            E = KE = hf = hc/wlength = 6.63 x 10^-34 J•s * 3.00 x 10⁸ nm/s/(439 nm * 1 m/10⁹ nm) = 4.53 x 10^-19 J

            KE = 4.53 x 10^-19 J - 4.41 x 10^-19 J  = 1.20 x 10^-20 J

      (d) # of e^- = 1.00 µJ x 1 J/10⁶ µJ * 1 e^-/1 photon * 1 photon/4.53 x 10^-19 J = 2.21 x 10¹² e^-