MCQ
Radius of the nucleus is equal to $10^{-12}\, cm.$ and that of the atom is equal to $10^{-8} \,cm.$ What is the fraction of the volume of the atom occupied by nucleus ?
- A$10^{12}$
- ✓$10^{-12}$
- C$10^{-20}$
- D$10^{-4}$
according to qes. Volume of nucleus $=\frac{4}{3} \pi r^{3}=\frac{4}{3} \pi\left(10^{-12}\right)^{3} \mathrm{cm}^{3}$
Volume of atom $=\frac{4}{3} \pi\left(10^{-8}\right)^{3} \mathrm{cm}^{3}$
$\frac{V_{N}}{V_{\text {atom}}}=\frac{10^{-36}}{10^{-24}}$
$\frac{V_{N}}{V_{\text {atom}}}=10^{-12}$
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