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KVPY SX SB Exam 2012 Question Paper

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Question : 39

Total: 120

A parent nucleus X is decaying into daughter nucleus Y which in turn decays to Z. The half lives of X and Y are 40000 years and 20 years respectively. In a certain sample, it is found that the number of Y nuclei hardly changes with time. If the number of X nuclei in the sample is 4×1020, the number of Y nuclei present in it is

2×1017
2×1020
4×1023
4×1020

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