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Nuclear radii can be estimated using the closest approach of an alpha particle.Nuclear radii can be determined using electron diffraction. Discuss the benefits of using electron diffraction rather than the closest approach of an alpha particle to evaluate nuclear radii.[3 marks] 2 Show that the relationship between nuclear radius R and nucleon number A is given by R=\left(\frac{3 u}{4 \pi \rho}\right)^{\frac{1}{3}} A^{\frac{1}{3}} where p is the density of nuclear material.

\text { Show that } \rho \text { is approximately } 2 \times 10^{17} \mathrm{~kg} \mathrm{~m}^{-3} \text {. }

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