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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. Afte 4.0h its activity is 8.00 mCi.
(a) Find the decay constant and half-life
How many atoms of the isotope were contained in the freshly preapared sample?
(c) What is the sample's activity 30.0 h after it is prepared?

Text Solution

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The correct Answer is:
A, B, C, D
(a) `R=R_0e^(-lambdat)`
`R_(0)=20MCl`
`R=8MCl`
`t=4.0h`
Find `lambda`.
(b) `R_(0)=lambdaN_(0)` . Find `N_(0)=(R_(0))/(lambda)`
(c) Find `R=R_(0e^(-lambdat))`
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