A Photoelectron Spectrum of Sodium Excited with X-Rays with an Energy

Multiple Choice

A photoelectron spectrum of sodium excited with x-rays with an energy of 1254 eV shows two peaks at kinetics energies of 1190 eV and 1223 eV. These peaks are assigned to the sodium 2s and 2p electrons. What is the energy of the 2s electron in sodium?

A) -31 eV
B) -33 eV
C) -64 eV
D) -128 eV
E) -1190 eV