A first order nuclear reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed [KCET 2001]

A first order nuclear reaction is half completed in 45 minutes. How lo

1.	A first order nuclear reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed [KCET 2001]
A.	5 hours
B.	7.5 hours
C.	10 hours
D.	20 hours
Answer» C. 10 hours

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A first order nuclear reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed [KCET 2001]

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