The K-shell binding energy of an electron in a lead atom is 88.0 keV and the L-shell energy is approximately 15.0 keV. A 100 keV photon ejects a K-shell electron.
a) What is the energy of the photoelectron?
b) An L-shell electron makes a transition to fill the K-shell vacancy. what is the energy of the photon emitted in this process?