Nucleus: Practice Problem & Solution
A radioactive sample with a half life of 1 month has the label: 'Activity = 2 micro curies on $1-8-1991$'. What would be its activity two months earlier? (1988)
Solution Explained:
To solve this problem, we apply the core principles of Nucleus. Understanding the underlying formula is key to arriving at the correct answer below:
Going backward in time by two months corresponds to adding 2 half-lives to the activity. The activity was $2 \times 2^2 = 2 \times 4 = 8$ micro curies.
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