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Find the maximum potential difference wh...

Find the maximum potential difference which may be applied across an X-ray tube with tungsten target without emitting any characteristics 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

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The correct Answer is:
[Less than 11.3 kV]
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