Number of nuclei of a radioactive substance at t = 0 are 1000 and 900 at t = 2 sec. The number of nuclei at t = 4 sec will be x10, then the value of x in number x10 is –
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(8)
In 2 sec only 
nuclei are left behind. Thus in next two second 
of 900 or 810 nuclei will be left.
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