The binding energy of the innermost elec...

The binding energy of the innermost electron in tungsten is `40 keV`. To produce characteristic `X` - rays using a tungsten target in an `X` - rays tube the potential difference `V` between the cathode and the anti - cathode should be

A

`V gt 40` kV

B

`V le 40` kV

C

`V gt 40` kV

D

`V gt //lt 40` kV

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The correct Answer is:

C

Applied voltage must be greater than binding energy .

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