Respuesta :

AJ135
After the first half-life period, 1/2 of the sample remains. 
After the 2nd period, only 1/4 remains. 
After the 3rd period, only 1/8 remains. 

Three half-life periods have been completed for 1/8 of the sample to remain, so 34.5/3 = 11.5 minutes. 

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.

Learn more about half-life here

https://brainly.com/question/4483570

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