What Is the Difference in Energy of the K _$\alpha$ X-Ray Lines of Carbon (Z = 6)and Silicon (Z

Multiple Choice

What is the difference in energy of the K _$\alpha$ X-ray lines of carbon (Z = 6) and silicon (Z = 14) ?

A) 1.14 keV
B) 1.98 keV
C) 1.47 keV
D) 1.63 keV
E) None of these is correct.