Radio active phosphorus `32` has a half life of `14` days. A source containing this isotope has an initial activity of 10 m Ci.

Radio active phosphorus `32` has a half life of `14` days. A source containing this isotope has an initial activity of 10 m Ci.
(i) What is the activity of the source after 42 days?
(ii) What time elapses before the activity of the source falls to 2.5 mCi?

Radio active phosphorus `32` has a half life of `14` days. A source containing this isotope has an initial activity of 10 m Ci. (i) What is the activi

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