Teaching HTET PGT Level 3 - 2024 Mock Test Physics Nuclear Physics Radioactivity

The activity of a radioactive material is 6.4 × 10-4 curie. Its half life is 5 days. The activity will become 5 × 10-6 curie after

1
7 days
2
15 days
3
25 days
4
35 days
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