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what is the formula to calculate half life. Below are shown three equivalent formulas describing exponential decay. Simply replacing the variable doesnt tell us everything though.
Half life time ln 2 ln beginning amount ending amount half life 11 69315 ln 32604 126 half life 15870 ln 25876. For a first order reaction t½ 0693 k and for a second order reaction t½ 1 k Ao. Input these values into our half-life calculator.
Where T 12 T 1 2 is half-life.
572 how old time n t 1 2 n is the number of half-lives and t 1 2 is the half-life in time. Calculate the half-life of a radioactive substance whose disintegration constant happens to be 0002 1years. For example N0 25 kg. For a zero order reaction the formula is t½ Ao 2k.