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JEE Main 2022 · 27 Jul · Shift 2, Physics question 48

The activity of a radioactive material is 6.4×10−46.4\times10^{-4} curie. Its half life is 5 days. The activity will become 5×10−65\times10^{-6} curie after :

Choose one option
Answer and worked solution

Official answer: D

Ratio. 6.4×10−45×10−6=128=27\frac{6.4\times10^{-4}}{5\times10^{-6}}=128=2^7: seven half lives, 35 days.

(D)

Topics:Radioactive decay
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