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Halveringstid

När något avtar exponentiellt, t.ex. ett radioaktivt ämne som sönderfaller, pratar man ibland om halveringstid. Det är den tid det tar för mängden av ämnet att halveras, alltså att hälften har sönderfallit. Halveringstiden är konstant, vilket betyder att oavsett hur mycket som är kvar tar det alltid en halveringstid för den resterande mängden att halveras.

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