Interpretation:
The amount of cobalt-60 left from 10 mg sample after one half life, two half lives and three half lives are to be calculated.
Concept introduction:
The time needed for one half of nuclei of radioisotope to decay into its products is the half life. The formula to calculate remaining amount of radioactive element is,
Where
Answer to Problem 9PP
Amount remains in one half life, two half lives and three half lives are 5 mg, 2.5 mg and 1.25 mg.
Explanation of Solution
The amount of the sample is 10 mg. For the first half life, the amount remains is,
For the two half lives, the amount remains is,
For the three half lives, the amount remains is,
The measurement of radioactive decay is done in half lives.
Chapter 24 Solutions
Chemistry: Matter and Change
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