The peaks arising from the 2s and 2p 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 = hν - BE ,

Substituting for hν (1253.6 eV) and the 2s level BE (64 eV) gives :

    KE = ( 1253.6 - 64 ) = 1190 eV

Substituting for hν (1253.6 eV) and the 2p level BE (31 eV) gives :

    KE = ( 1253.6 - 64 ) = 1223 eV

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