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[latex]1. B.\E_1 = -E_{o}\E_{n} = -E_{o}cdotfracP1}{n^{2}}\E_4 = -E_{o}cdotfrac{1}{4^{2}} = -frac{1}{16}E_{o}\\2. D.\r_1 = r\n = 4\r_{n} = rcdot n^{2}\r_4 = rcdot4^{2} = 16r\\3. B.\E_3 = -0,24cdot10^{-18}J\E_2 = -0,55cdot10^{-18}J\E = E_3 - E_2 = -0,24cdot10^{-18}J - (-0,55cdot10^{-18}J) = 0,31cdot10^{-18} J\\4. A.\lambda = 248 nm = 2,48cdot10^{-7} m\E_{f} = hcdotfrac{c}{lambda}\E_{f} = 6,63cdot10^{-34}Jscdotfrac{3cdot10^{8}m/s}{2,48cdot10^{-7}m}=8,02cdot10^{-19} J[/latex] [latex]5. B.\\frac{1}{lambda} = R_{h}(frac{1}{2^{2}}-frac{1}{4^{2}})\\frac{1}{lambda} = R_{h}(frac{4}{16}-frac{1}{16})\\frac{1}{lambda} = frac{3R_{h}}{16}\\lambda = frac{16}{3R_{h}}\\6. D.\hcdot f = W+E_{k}\\7. A.[/latex]