Answer :
Final answer:
To determine the time required for the activity of cesium-137 to fall to 13.3 percent of its original value, we can use the concept of half-life.
Explanation:
To determine how much time is required for the activity of a sample of cesium-137 to fall to 13.3 percent of its original value, we can use the concept of half-life.
The half-life of cesium-137 is 30.2 years, which means that after each half-life period, the activity of the sample is reduced by half.
We can use the formula N = N0 * (1/2)(t/T), where N is the current activity, N0 is the original activity, t is the time passed, and T is the half-life.
By substituting the values into the formula, we can solve for t and find the required time.
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