The number of atoms of a radioactive sub...

The number of atoms of a radioactive substance at t = 0 is ` 8 xx 10^(4)` . Its half- life periodis 4 years. The number of atoms left undecayed will be ` 1 xx 10 ^(4)` after an interval of

A

9 years

B

12 years

C

16 years

D

None

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The correct Answer is:

B

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