Radon $({R_n})$ decays into Polonium (${P_0}$) by emitting an $\alpha - $ particle with half-life of $4\, days$. A sample contains $6.4 \times {10^{10}}$ atoms of $R_n$. After $12\, days$, the number of atoms of ${R_n}$ left in the sample will be
Radon $({R_n})$ decays into Polonium (${P_0}$) by emitting an $\alpha - $ particle with half-life of $4\, days$. A sample contains $6.4 \times {10^{10}}$ atoms of $R_n$. After $12\, days$, the number of atoms of ${R_n}$ left in the sample will be
- A
$3.2 \times {10^{10}}$
- B
$0.53 \times {10^{10}}$
- C
$2.1 \times {10^{10}}$
- D
$0.8 \times {10^{10}}$
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