[tex]Dane:\\\lambda = 30 \ m = 3\cdot10 \ m\\v = c = 3\cdot10^{8}\frac{m}{s}\\Szukane:\\f = ?\\\\Rozwiazanie\\\\\lambda = \frac{v}{f} \ \ \rightarrow \ \ f = \frac{v}{\lambda}\\\\f = \frac{3\cdot10^{8}\frac{m}{s}}{3\cdot10 \ m}=10^{7} \ Hz= 10\cdot10^{6} \ Hz\\\\\boxed{f = 10 \ MHz}[/tex]
[tex](1 \ MHz = 1 \ 000 \ 000 \ Hz = 10^{6} \ Hz)[/tex]
