Asked by Elisabeth
The half-life of oxygen -15 is 124 seconds. If a sample of oxygen -15 has an activity of 4000 becquerels, how many minutes will elapse before it reaches an acivity of 500 becquerels
Answers
Answered by
DrBob222
Calculate k from k = 0.693/t<sub>1/2</sub> and substitute into the following:
ln(No/N) = kt
No = 4000
N = 500
solve for t, which will be in seconds, and convert to minutes.
ln(No/N) = kt
No = 4000
N = 500
solve for t, which will be in seconds, and convert to minutes.
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