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VU UUJ 1. . 92. A mixture consists of two radioactive materials Au , and Az with half lives of 20 s and 10 s respectively. The amount of the two in the mixture will become equal after 1. 60 S 2. 80 S 3.20 S (4) 40 s 93. The half life of a radioactive isotope 'X' is 20 years. It

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