1.

A radioactive element has a half-life of 20 minutes. How much time should elapse before the element is reduced to (1)/(8)th of the original mass

Answer»

40 minutes
60 minutes
80 minutes
160 minutes

Solution :`t_(1//2) = 20` minute, `N = (1)/(9)N_(0)`
USE, `t = (2.303)/(0.693) XX t_(1//2) "log"(N_(0))/(N)`


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