A first order nuclear reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completedA. 5 hoursB. 7.5 hoursC. 10 hoursD. 20 hours

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 completedA. 5 hoursB. 7.5 hoursC. 10 hoursD. 20 hours
Answer» Correct Answer - B `k = (0.693)/(0.75 hr) = (2.303)/(t) "log" (a)/(a - 0.999a)` `= (2.303)/(t) log 10^(3) = 7.5 hr`

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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 completedA. 5 hoursB. 7.5 hoursC. 10 hoursD. 20 hours

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