1.
[tex]dane:\\n = 10\\t = 20 \ s\\szukane:\\f = ?\\\\f = \frac{n}{t}\\\\f = \frac{10}{20 \ s} = 0,5 \ Hz[/tex]
2.
[tex]dane:\\f = 4 \ Hz = 4 \frac{1}{s}\\v = 0,4\frac{m}{s}\\szukane:\\\lambda = ?\\\\\lambda = v\cdot T\\\\T = \frac{1}{f}, \ zatem\\\\\lambda = \frac{v}{f}\\\\\lambda = \frac{0,4\frac{m}{s}}{4\frac{1}{s}}= 0,1 \ m[/tex]
3.
[tex]dane:\\f = 92,8 \ MHz = 92,8\cdot10^{6} \ Hz = 9,28\cdot10^{7} \ Hz\\v = 300 \ 000 \ \frac{km}{h} = 3\cdot10^{8}\frac{m}{s}=30\cdot10^{7}\frac{m}{s}\\szukane:\\\lambda = ?\\\\\lambda = \frac{v}{f}\\\\\lambda = \frac{30\cdot10^{7}\frac{m}{s}}{9,28\cdot10^{7} \ Hz}\approx 3,23 \ m[/tex]
