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

At time t = 0 , number of nuclei of a radioactive substance is 100. At t = 1 s this number becomes 90. Find the number of nuclei at t = 2s.

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In 1 second 90% of the nuclei have remained undecayed , so in another 1 second 90% of 90.
i.e., 81 nuclei will remain undecayed.
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