Concept explainers
If 40 mg of a radioactive substance decays to 5 mg in 12 min, then we have to find half-life, in minutes, of the substance.
Answer to Problem 14CR
Option b) 4 min is correct.
Explanation of Solution
Given information:
Initial quantity =40mg
Substance decay to 5 mg in 12 min
To find the half-life we will use the formula,
Where
We put the values given in formula, we get,
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Algebra and Trigonometry: Structure and Method, Book 2
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