PG entrance exam CUET PG 2025 Mock Test Physics Nuclear Physics Radioactivity

Two radioactive samples X and Y have the same number of nuclei initially. If their half-lives are 10 minutes and 20 minutes respectively, then the ratio of the remaining number of X and Y after 120 minutes is

1
1 ∶ 16  
2
64 ∶ 1
3
1 ∶ 64
4
1 ∶ 1
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