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A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after 5 years will be
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a
132
b
15
c
12
d
45
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Correct option is A
Number of half-lives n=51=5Now NN0=12n⇒NN0=125=132Similar Questions
The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
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