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JEE Main 2022 Physics question

PhysicsNucleiJEE Main 2022

A sample contains kg each of two substances A and B with half lives 4 s and 8 s respectively. The ratio of their atomic weights is 1 : 2. The ratio of the amounts of A and B after 16 s is x/100. The value of x is .

Answer: 25

Solution

After 16 s, A has gone through 4 half-lives and B through 2. The remaining masses are = and = , so / = 1/4 = 25/100. So

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Question ID VK-024185