AP Physics 2 : Radioactive Nuclear Decay
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Example Question #62 : Atomic And Nuclear Physics
If an unknown compound undergoes radioactive decay such that 
In this question, we're told that a radioactive compound is decaying, and we're asked to determine the rate constant for the process.
Because radioactive decay reactions are first-order, we can use the first-order reaction equation.
Rearranging this expression, we can isolate the rate constant term, 
Now, we can plug in the values that were given to us in the question stem to calculate the answer.
Example Question #63 : Atomic And Nuclear Physics
If it takes a radioactive compound 
In this question, we're told that a radioactive compound has decayed by a certain amount in a given amount of time. We're asked to find the rate constant.
First, we have to recognize that all radioactive decay reactions follow first-order kinetics. Hence, we can use the first-order rate equation to solve this question.
Because we're told that 
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