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The sample of a radioactive substance ha...

The sample of a radioactive substance has `10^6` nucei. Its half life is 20 s . The number of nuclei that will be left after 10 s is neary .

A

`7xx10^5`

B

`8.5xx10^5`

C

`8xx10^5`

D

`7.5xx10^5`

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The correct Answer is:
A
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