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At time t=0 , number of nuclei of a radi...

At time `t=0` , number of nuclei of a radioactive substance are `100.` At `t=1` s these numbers become `90`. Find the number of nuclei at `t=2 s`.

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in 1 second 90% of the nuclei have remained undecayed , so in another 1 second 90 % of i.e., , 81 nuclei will remain undecayed .
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DC PANDEY-NUCLEI-C MADICAL ENTRANCES GALLERY
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