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Grade: upto college level
        Find the maximum potential difference which may be applied across an X-ray tube with tungsten target without emitting any characteristic K or L X-ray. The energy levels of the tungsten atom with an electron knocked out are as follows. 

Cell containing vacancy K L M
Energy in keV 69.5 11.3 2.3
5 years ago

Answers : (1)

Navjyot Kalra
askIITians Faculty
654 Points
							Let for, k series emission the potential required = v
∴ Energy of electrons = ev
This amount of energy ev = energy of L shell
The maximum potential difference that can be applied without emitting any electron is 11.3 ev.

						
5 years ago
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