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The decay constant for a radioisotope is 15.0 ✕ 10−7 s−1. Determine the following for this...

The decay constant for a radioisotope is 15.0 ✕ 10−7 s−1. Determine the following for this radioisotope.

(a) half-life (in s) _________s

(b) number of nuclei required to create an activity of 25.0 mCi __________ nuclei

(c) the number of nuclei that decay during a 140 h time interval after the activity is 25.0 mCi _________ nuclei

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