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Rn decays into Po by emitting an alpha-p...

Rn decays into Po by emitting an `alpha`-particle with half-life of 4 days. A sample contains `6.4 xx 10^10` atoms of Rn. After 12 days, the number of atoms of Rn left in the sample will be

A

`3.2 xx 10^10`

B

`0.53 xx 10^10`

C

`2.1 xx 10^10`

D

`0.8 xx 10^10`.

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