When a filament electron knocks out a K shell electron from the tungsten atom, it leads to

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When a filament electron knocks out a K shell electron from the tungsten atom, it leads to the emission of a characteristic x-ray photon. This is because the vacancy created in the K shell is filled by an electron from a higher energy level, releasing a photon with energy specific to the difference in energy levels, characteristic of the tungsten atom.

When a Filament Electron Knocks Out a K Shell Electron