Use the same time unit for half-life and time elapsed.
0 remaining
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Percent remaining
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Amount decayed
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Decay constant (ฮป)
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Mean lifetime (ฯ)
Frequently Asked Questions
What is half-life?
Half-life is the time it takes for a quantity to fall to half its value. After each half-life the remaining amount halves: N = Nโ ร (1/2)^(t / half-life).
Calculate the remaining quantity after radioactive (or other) decay using half-life.