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10 g of a radioactive isotope is reduced to 1.25 g in 12 yr. Calculate the half-life period of the isotope.

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a
4 yr
b
3 yr
c
8 yr
d
24 yr

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detailed solution

Correct option is A

10g⟶t1/25g⟶t1/22.5g⟶t1/21.25g3×t1/2=12yr∴ t1/2=123=4yr

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