Two isotopes `P` and `Q` atomic weight `10` and `20`, respectively are mixed in equal amount by
Channel: Doubtnut
Date: 2020-04-12

Two isotopes `P` and `Q` atomic weight `10` and `20`, respectively are mixed in equal amount by weight. After `20` days their weight ratio is found to be `1:4`. Isotope `P` has a half-life of `10` days. The half-life of isotope `Q` is