[tex]Dane:\\\lambda_1 = 400 \ nm = 400\cdot10^{-9} \ m = 4\cdot10^{-7} \ m\\\lambda_2 = 700 \ nm = 700\cdot10^{-9} \ m = 7\cdot10^{-7} \ m\\c = 3\cdot10^{8}\frac{m}{s}\\Szukane:\\f_1, f_2 = ?\\\\Rozwiazanie\\\\f = \frac{c}{\lambda}\\\\f_1 = \frac{3\cdot10^{8}\frac{m}{s}}{4\cdot10^{-7} \ m} = 0,75\cdot10^{15} \ Hz=0,75 \ PHz\\\\f_2 = \frac{3\cdot10^{8}\frac{m}{s}}{7\cdot10^{-7} \ m} = 0,43\cdot10^{15} \ Hz = 0,45 \ PHz\\\\(petaherc \ - \ 1 \ PHz = 10^{15} \ Hz)[/tex]
