Two elements `P` and `Q` have half-line of `10` and `15` minutes repectively. Freshly preapared sample of mixuture containing equal number of atoms is allowed to decay for `30` minutes. The ratio of number of atoms of `P` and `Q` in left in mixture is:A. `0.5`B. `2.0`C. `3.0`D. `4.0`

Two elements `P` and `Q` have half-line of `10` and `15` minutes repec

1.	Two elements `P` and `Q` have half-line of `10` and `15` minutes repectively. Freshly preapared sample of mixuture containing equal number of atoms is allowed to decay for `30` minutes. The ratio of number of atoms of `P` and `Q` in left in mixture is:A. `0.5`B. `2.0`C. `3.0`D. `4.0`
Answer» Correct Answer - `(a)` `N_(p) = N_(OP).e^((0.693xx30)/(10)) = N_(op).e^(-0.693xx3)` `N_(Q) = N_(oQ).e^(-(0.693xx30)/(15)) = N_(OQ).e^(-0.693xx2)` `:. (N_(p))/(N_(Q)) = e^(-0.693) = 0.5`

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