dwenger726 dwenger726

18-05-2023
Physics

contestada

A 22Na source is labeled 2. 50 mCi, but its present activity is found to be 2. 31 ✕ 107 Bq.

(a) What is the present activity in mCi?

(b) How long ago did it actually have a 2. 50-mCi activity?

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