[tex]Dane:\\\lambda= 30 \ m\\f = 60 \ Hz = 60 \frac{1}{s}\\Szukane:\\v = ?\\\\Rozwiazanie\\\\v = \frac{\lambda}{T}\\\\ale:\\\\T = \frac{1}{f}, \ zatem\\\\\underline{v = \lambda\cdot f}\\\\v = 30 \ m\cdot60 \frac{1}{s}\\\\\boxed{v = 1800\frac{m}{s}}[/tex]
Odp. Szukana prędkosć dźwięku v = 1800 m/s.
