Atoms And Nuclei

Highly energetic electrons are bombarded on a target of an element containing 30 neutrons. The ratio of radii of nucleus to that of Helium nucleus is \((14)^{\frac{1}{3}}\). Find

(A) Atomic number of the nucleus;

(B) the frequency of \(\mathrm{K}_{\alpha}\) line of the X-ray produced.

\(\left(\mathrm{R}=1.1 \times 10^{7} \mathrm{~m}^{-1}\right.\) and \(\left.c=3 \times 10^{8} \mathrm{~m} / \mathrm{s}\right)\)