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Two radioactive substances X and Y initi...

Two radioactive substances `X` and `Y` initially contain an equal number of atoms. Their half-lives are `1` hour and `2` hours respectively. Then the ratio of their rates of disintergration after two hours is

A

`1:4`

B

`1:2`

C

`3:4`

D

`2:3`

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The correct Answer is:
A
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