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NEET 2017 Physics question

PhysicsNucleiNEET 2017

Radioactive material 'A' has decay constant '' and material 'B' has decay constant ''. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that of 'A' will be ?

Answer: (2)

Solution

Let each sample start with nuclei. Then and . Taking the ratio of the number of nuclei of the faster decaying material to the slower one: . Setting this equal to

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Question ID VK-092017