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what is the equation for half life. Hence the half-life of this particular radioactive substance is 3465 years. Because it takes the isotope 267 hours to reach 25 and there are only 2 halves from 100 to 25 divide 2672 and youll get 1335 hours as the half life.
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The half-life of some radio active elements is very small for example the half-life of radon gas is 38 days and that of uranium-239 is 235 minutes. Finding HALF LIFE KristaKingMath - YouTube. T_ frac 1 2frac ln2 lambdafrac 0693 lambda t21.
In this equation T12 is the half-life.
It is denoted by the symbol t 12 and is usually expressed in seconds. So lets get some space over here. The term is also used more generally to characterize any type of exponential or non-exponential decay. T 12 is the half-life t is the mean lifetime l is the decay constant.
