[tex]Dane:\\f = 300 \ kHz = 300 \ 000 \ Hz = 3\cdot10^{5} \ Hz\\v = c = 3\cdot10^{8}\frac{m}{s}}\\Szukane:\\\lambda = ?\\\\Rozwiazanie\\\\\lambda = c\cdot T\\\\ale \ \ T = \frac{1}{f}\\\\zatem\\\\\underline{\lambda = \frac{c}{f}}\\\\\lambda = \frac{3\cdot10^{8}\frac{m}{s}}{3\cdot10^{5} \ Hz} = \frac{3\cdot10^{8}\frac{m}{s}}{3\cdot10^{5} \ \frac{1}{s}}\\\\\boxed{\lambda = 10^{3} \ m = 1000 \ m}\\\\\underline{Odp. \ B.}[/tex]
