The half-life of a radioactive element is 10 minutes. If the initial – McqOptions

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1.	The half-life of a radioactive element is 10 minutes. If the initial count rate is 368 counts per minute, then the time for which count rate reaches 46 counts per minute would be?
A.	30 minutes
B.	40 minutes
C.	15 minutes
D.	23 minutes
Answer» B. 40 minutes

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