The statement, that describes half life of krypton-74 is "11.5 minutes."
What is half-life?
The half-life of a quantity is the time it takes for it to decline to half of its original value. In terms of chemical reaction, the half-life is defined as the time it takes for the reactant concentration to reach half of its initial value.
In a half-life calculation, half of the sample survives after the initial half-life time. Only 1/4 of the game left after the second period. Only 1/8 of the game left after the third period. As a result, three half lives have occurred, yielding 1/8.
Thus,
[tex]=\frac{34.5\;min}{3}\\= 11.5\;min[/tex]
Hence the correct option is 11.5 minutes.
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