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The mass of a radioactive substance follows a continuous exponential decay model, with a decay
rate parameter of 5.1% per day. Find the half-life of this substance (that is, the time it takes for
one-half the original amount in a given sample of this substance to decay).
Solution
Half life = log2/ decay constant = 0.693/ decay constant
Decay constant 5.1% = 0.051
So, Half life =0.693 /0.051 = 13.58 days

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  • 1. The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of 5.1% per day. Find the half-life of this substance (that is, the time it takes for one-half the original amount in a given sample of this substance to decay). Solution Half life = log2/ decay constant = 0.693/ decay constant Decay constant 5.1% = 0.051 So, Half life =0.693 /0.051 = 13.58 days