[tex]Dane:\\f = 4 \ Hz = \frac{4}{s}\\v = 4\frac{m}{s}\\Szukane:\\\lambda = ?\\T = ?\\\\\\\lambda = v\cdot T\\\\T = \frac{1}{f}, \ zatem\\\\\lambda = \frac{v}{f}\\\\\lambda = \frac{4\frac{m}{s}}{\frac{4}{s}}\\\\\boxed{\lambda = 1 \ m}\\\\T = \frac{1}{f}\\\\T = \frac{1}{\frac{4}{s}}\\\\\boxed{T = 0,25 \ s}[/tex]
