[latex]dane:\m = 4\n = 2\E_1 = -13,6 eV = -13,6eVcdot1,6cdot10^{-19}frac{J}{eV} = -21,76cdot10^{-19} J\1 eV = 1,6cdot10^{-19} J\h = 6,63cdot10^{-34} Jcdot s\szukane:\E = ?\f = ?\\Rozwiazanie:\E = E_{m}-E_{n} = E_1(frac{1}{m^{2}}-frac{1}{n^{2}})\\E = -21,76cdot10^{-19}Jcdot(frac{1}{4^{2}}-frac{1}{2^{2}})\\E = -21,76cdot10^{-19}Jcdot(frac{1}{16}-frac{4}{16})\\E = -21,76cdot10^{-19}Jcdot(-frac{3}{16})\\E = 4,08cdot10^{-19} J[/latex] [latex]E = hcdot f /:h\\f = frac{E}{h}\\f = frac{4,08cdot10^{-19}J}{6,63cdot10^{-34}Jcdot s}approx 0,62cdot10^{15} Hz = 0,62 PHz (Petaherca)[/latex]
