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Can someone help with my physics question pkease with explanation? The max characteristic x-ray photon energy...

Can someone help with my physics question pkease with explanation?

The max characteristic x-ray photon energy comes from the capture of a free electron into a K shell vacancy. What is this photon energy in keV for tungsten, assuming the free electron has no initial kinetic energy?
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Answer #1

the energy is required to remove an electron from the K shell can be,

Ek = ( Z - 1 )2 Eo

here Eo = 13.6 eV

= ( 46 - 1 )2 x 13.6

= 452 x 13.6

= 2025 x 13.6

Ek = 27540 eV

so the photon energy in keV for tungsten is Ek = 27.540 keV.

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