1 Answer

SMM · Answer 1 · 2023-06-06T15:25:42+0000

Answer:

3.5 yrs

Step-by-step explanation:

If a sample has decayed to 25%, this means 2 half-lives have passed. We are given this is equal to 7 yrs, and it follows that one half life is 3.5 yrs.

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