The KE of the Na 1s photoelectrons will be ca. 182 eV

Rationale

The KE of the photoelectrons is given by the eqtn.

    KE = hν - BE ,

substituting for hν (1253.6 eV) and the 1s level BE (1072 eV) gives :

    KE = ( 1253.6 - 1072 ) = 182 eV

 

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