A radioactive substance decays from 60mg to 12.6mg in 20 years according to the exponential decay model y=ae-bx, where a is the initial amount and y is the amount remaining after x years. a) find the b -value b) Use the exact b-value to write the exponential decay model for this substance with initial amount 60 mg, then use that model to find the half-life

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Chapter30: Nuclear Physics
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A radioactive substance decays from 60mg to 12.6mg in 20 years according to the exponential decay model y=ae-bx, where a is the initial amount and y is the amount remaining after x years.

a) find the b -value

b) Use the exact b-value to write the exponential decay model for this substance with initial amount 60 mg, then use that model to find the half-life. 

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