The radius of nucleus of an isotope ${ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X}$ is $1.5 \times 10^{-15} \mathrm{~A}^{1 / 3} \mathrm{~m}$. Assume that the number of protons and neutrons in the nucleus is same and the mass $m_{\text {proton }}=m_{\text {neutron }}$. The approximate value of the nuclear density, in $\mathrm{kg} . \mathrm{m}^{-3}$, is closest to

• Correct answer
  A

  $10^{17}$
• B

  $10^{19}$
• C

  $10^{13}$
• D

  $10^{15}$

Hence, the correct answer is option: 'A'.