If a radioactive substance reduces to \[\frac{1}{16}\] of its original – McqOptions

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1.	If a radioactive substance reduces to \[\frac{1}{16}\] of its original mass in 40 days, what is its half-life [DCE 2001; AIIMS 2003]
A.	10 days
B.	20 days
C.	40 days
D.	None of these
Answer» B. 20 days

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