# Solve this :11.  Two isotopes P and Q of 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  (1)   Zero                               (2)  5 days                                (3)  20 days                                 (4)  infinite

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