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1 g atom of an alpha-emitting .(z)X^(4) ...

`1 g` atom of an `alpha`-emitting `._(z)X^(4)` (half life = 10 hr) was placed in sealed containers, `4.52 xx 10^(25)`. Helium atoms will accumulate in the container after

A

4.52 hr

B

10.00 hr

C

9.40 hr

D

20.00 hr

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The correct Answer is:
D
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