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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 gt / lt 40 KV

C

V lt 40 KV

D

`V lt= 40 KV`

Text Solution

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The correct Answer is:
A
The applied voltage must be more than the binding energy .
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