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A freshly prepared sample of a certain r...

A freshly prepared sample of a certain radioactive isotope has an activity of `10mCi`. After `4.0h` its activity is `8.00 mCi.`
(a) Find the decay constant and half-life
(b) How many atoms of the isotope were contained in the freshly prepared sample?
(c) What is the sample's activity `30.0 h` after it is prepared?

Text Solution

Verified by Experts

The correct Answer is:
(a) ` 1.55 xx10^(-5) //sec , 12.4 h` (b) `2.39 xx106(13)` atoms (c) `1.87 mCi`
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