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The half-life of cobalt 60 is 5.25 yrs. ...

The half-life of cobalt `60` is `5.25` yrs. After how long does its acitvity reduce to about one eight of its original value?

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To solve the problem of how long it takes for the activity of cobalt-60 to reduce to one-eighth of its original value, we can follow these steps: ### Step-by-Step Solution: 1. **Understand Half-Life**: The half-life of a radioactive substance is the time taken for half of the substance to decay. For cobalt-60, the half-life is given as 5.25 years. 2. **Determine the Reduction Factor**: We need to find out how many half-lives it takes for the activity to reduce to one-eighth (1/8) of its original value. ...
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