NEET Physics Nuclei Questions Solved

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A radio isotope has a half life of 75 years. The fraction of the atoms of this material that would decay in 150 years will be

(a) 66.6%               (b) 85.5%
(c) 62.5%               (d) 75%

(d) Number of half lives in 150 years  n=15075=2
Fraction of the atom of decayed = 1-12n

=1-122=34=0.75  Percentage decay = 75%

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