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

JEE Main 2022 Physics question

The activity of a radioactive material is curie. Its half life is 5 days. The activity will become curie after

Answer: (4)

, so = . So t/5 = 7 and t = 35 days.

Question ID VK-034283