The peaks arising from the 2*s* and 2*p* levels will occur at kinetic energies of ca. 1190 eV and 1223 eV respectively.

**Rationale**

The KE of the photoelectrons is given by the eqtn. KE = Substituting for KE = ( 1253.6 - 64 ) = Substituting for KE = ( 1253.6 - 64 ) = |