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A sample of a radioactive substance has ...

A sample of a radioactive substance has `10^(6)` radioactive nuclei. Its half life time is 20 s How many nuclei will remain after 10 s ?

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`N = N_(0) ((1)/(2))^(n) = 10^(6) xx ((1)/(6))^(1//2)` as `n = (10)/(20) = (1)/(2) = (10^(6))/(1.4)`
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