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JEE Main 2022 · 29 Jun · Shift 1, Physics question 33

The activity of a radioactive material is 2.56×10−32.56\times10^{-3} Ci. If the half life of the material is 5 days, after how many days the activity will become 2×10−52\times10^{-5} Ci ?

Choose one option
Answer and worked solution

Official answer: B

Halvings. 2.56×10−32×10−5=128=27\frac{2.56\times10^{-3}}{2\times10^{-5}}=128=2^7: 7×5=357\times5=35 days.

(B)

Topics:Radioactive decay
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