The half-life of a radioactive substance is 40 years. How long will it – McqOptions

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1.	The half-life of a radioactive substance is 40 years. How long will it take to reduce to one fourth of its original amount and what is the value of decay constant [DPMT 2003]
A.	40 year, 0.9173/year
B.	90 year, 9.017/year
C.	80 year, 0.0173 year
D.	None of these
Answer» D. None of these

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