3.
[tex]Dane:\\n = 10011\\t = 1 min = 60 \ s\\Szukane:\\f = ?\\T = ?\\\\f = \frac{n}{t}\\\\f = \frac{10011}{60 \ s}\\\\\boxed{f =166,85 \ Hz}\\\\T = \frac{1}{f}\\\\T = \frac{1}{166,85 \ \frac{1}{s}}\\\\\boxed{T = 0,006 \ s}[/tex]
4.
[tex]Dane:\\f = 0,111 \ Hz = 0,111 \frac{1}{s}\\v = 0,117\frac{m}{s}\\Szukane:\\\lambda = ?\\T = ?\\\\v = \lambda\cdot f \ \ /:f\\\\\lambda = \frac{v}{f}\\\\\lambda = \frac{0,117\frac{m}{s}}{0,111\frac{1}{s}}\\\\\boxed{\lambda = 1,05 \ m}\\\\T = \frac{1}{f}\\\\T = \frac{1}{0,111 \frac{1}{s}}\\\\\boxed{T = 9 \ s}[/tex]
