1. The problem statement, all variables and given/known data The K characteristic X-ray line for tungsten has a wavelength of 1.94 10-11 m. What is the difference in energy between the two energy levels that give rise to this line? Express this in each of the following units. (a) joules J (b) electron volts eV 2. Relevant equations ? 3. The attempt at a solution How do I find the two energy levels?