Chapter 5, Problem 43AP

In the hydrogen atom, the transition from the 2p state to the 1s state emits a photon with energy $\text{16}.\text{2}\times \text{1}{0}^{-\text{19}}\text{J}$ . In an iron atom, the same transition emits X-rays with wavelength 0.193 nm. Calculate the energy difference betweenthese two states in iron. Explain the difference in the 2p-1s energy level spacing in these two atoms.