Frekwens

Det ianhaid för't frekwens as en SI-ianhaid an het Hertz (Hz). Diarbi as

• 1 Hz = s⁻¹.

At jaft oober uk ööder ianhaiden, t.b.

• min⁻¹ of
• h⁻¹.

Det frekwens ${\displaystyle f}$ faan en stüdagen föörgang as fäästlaanj üs di kiarwäärs faan't perioodendüür ${\displaystyle T}$:

${\displaystyle f={\frac {1}{T}}}$ .

Bi waagen hinget det frekwens mä't faard ${\displaystyle c}$ an det waagenlengde ${\displaystyle \lambda }$ tuup:

${\displaystyle f={\frac {c}{\lambda }}}$.

Bi elektromagneetisk waagen as

${\displaystyle c={\tfrac {c_{0}}{n}}}$ an ${\displaystyle \lambda ={\tfrac {\lambda _{0}}{n}}}$.

Diarbi as ${\displaystyle c_{0}}$ at faard faan't laacht uun a leesag rüm, ${\displaystyle \lambda _{0}}$ det waagenlengde diar an ${\displaystyle n}$ det breegtaal faan't meedium. Wan det meedium wakselt, feranre faard an waagenlengde jo. Man det frekwens blaft detsalew!