NEET Physics Nuclei Questions Solved


99% of a radioactive element will decay between

(a) 6 and 7 half lives             (b) 7 and 8 half lives
(c) 8 and 9 half lives             (d) 9 half lives

(a) N=N012nNN0=12n1100=12n2n=100

n comes out in between 6 and 7.

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