If the lowest energy X-rays have `lambda=3.055xx10^(-8)` m, estimate the minimum difference in energy between two Bohr's orbits such that an electronic transition would correspond to the emission of an X-ray. Assuming that the electrons in other shells exert no influence, at what Z (minimum) would a transition form the second level to the first result in the emission of an X-ray?

Options

A. 1
B. 2
C. 3
D. 4