The ratio activity of an element becomes 1/64th of its original value – McqOptions

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1.	The ratio activity of an element becomes 1/64th of its original value in 60 sec. Then the half life period is [MP PMT 2002]
A.	5 sec
B.	10 sec
C.	20 sec
D.	30 sec
Answer» C. 20 sec

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