Odpowiedź :
1.
[tex]f = 20 \ Hz = 20 \frac{1}{s}\\\\T = \frac{1}{f}\\\\T = \frac{1}{20\frac{1}{s}}\\\\\boxed{T = 0,05 \ s}[/tex]
2.
[tex]T = 0,2 \ s\\\\f = \frac{1}{T}\\\\f = \frac{1}{0,2 \ s}\\\\\boxed{f = 5 \ Hz}[/tex]
1.
[tex]f = 20 \ Hz = 20 \frac{1}{s}\\\\T = \frac{1}{f}\\\\T = \frac{1}{20\frac{1}{s}}\\\\\boxed{T = 0,05 \ s}[/tex]
2.
[tex]T = 0,2 \ s\\\\f = \frac{1}{T}\\\\f = \frac{1}{0,2 \ s}\\\\\boxed{f = 5 \ Hz}[/tex]