A radioactive substance has a half-life of 60 minutes. After 3 hours, – McqOptions

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1.	A radioactive substance has a half-life of 60 minutes. After 3 hours, the fraction of atom that have decayed would be
A.	12.5%
B.	0.875
C.	8.5%
D.	0.251
Answer» C. 8.5%

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