Number of nuclei of a radioactive substa...

Number of nuclei of a radioactive substance are `1000` and `900` at times `t=0` and time `t=2 s`. Then, number of nuclei at time `t=4s` will be

800

810

790

700

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The correct Answer is:

(b) In `2 sec` only `90 %` nuclei are left behind. Thus in next two second `90 %` of `900` or `810` nuclei will be left.

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