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Questions  

A radio-isotope has half life of 5years. The fraction of the atoms of this material that would decay in 15 years will be

a
1
b
2/3
c
7/8
d
5/8

detailed solution

Correct option is C

NN0=(12)n=(12)15/5=18   Fraction decayed =N0−N=N0−N08=78N0

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