Surviving fraction after n half-lives (N = N₀ (1/2)^{t/t½})

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N = N₀ (1/2)^{t/t½}

What each symbol means

SymbolWhat it stands for
NRemaining nuclei
tElapsed time
N_0Initial
t_{1/2}Half-life

When to use this

Half-life constant; good for quick counting problems.