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Q.

99%  of a radioactive element will decay between

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a

6 and 7 half-lives

b

7 and 8 half-lives

c

8 and 9 half-lives

d

9 half-lives

answer is A.

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Detailed Solution

N=N012n⇒NN0=12n⇒1100=12n ⇒2n=100.n comes out in between 6 and 7.
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