[tex]Dane:\\\lambda = 5\cdot10^{-6} \ m\\ c = 3\cdot10^{8}\frac{m}{s}\\Szukane:\\f = ?\\\\Rozwiazanie\\\\\lambda = c\cdot T\\\\ale \ \ T = \frac{1}{f}, \ zatem:\\\\\lambda = \frac{c}{f} \ \ \ |\cdot f\\\\\lambda \cdot f = c \ \ \ |:\lambda\\\\\underline{f = \frac{c}{\lambda}}\\\\f = \frac{3\cdot10^{8}\frac{m}{s}}{5\cdot10^{-6} \ m} =0,6\cdot10^{14} \ Hz\\\\\boxed{f = 6\cdot10^{13} \ Hz}[/tex]
Odp. Częstotliwość tej fali wynosi 6 · 10¹³ Hz.
