Interpretation : The question is to find the year when the decay rate of Cesium-137 will be 17 counts per minute.
Concept Introduction: The exponential decay equation involving half-life can be written as,
Here, A is the final amount,
Answer to Problem 89A
The year at which the decay rate of Cesium-137 will be 17 counts per minute is 2135.
Explanation of Solution
Given information: The half-life of the radioisotope Cesium-137 is 30 years. The decay rate of a sample in the year 1985 is 544 counts per minute.
Using the exponential decay equation and substituting the given values,
Hence, the decay rate of Cesium-137 will be 17 counts per minute in the year 2135.
Chapter 25 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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