Svingningstid
Svingningstiden, eller mere generelt perioden, er den tid det tager et svingende system at gennemføre en hel svingning. Ordet svingningstid bruges nok oftest i forbindelse med tidslige sinusbølger mens ordet periode bruges mere generelt i forbindelse periodiske funktioner.
Svingningstiden er 1/frekvensen.
For en sinusbølge vil svingningstiden være tiden mellem to toppe.
En periodisk funktion er en funktion der gentager sig selv med en vis periode. Den matematiske definition er
- for alle x,
hvor er perioden.
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