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The wavelength of Kalpha X-ray of tungst...

The wavelength of `K_alpha` X-ray of tungsten is `21*3` pm. It takes `11*3` keV to knock out an electron from the L shell of a tungsten atom. What shoulb be the minimum accelerating voltage across an X-ray tube having trungsten target which allows production of `K_alpha` X-ray?

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Here lambda =21.3xx10^-12p m `
` Now , E_X-E_L=1242/(21.3xx10^-3) `
` =58.309KeV `
` E_L=11.3Kev, `
` Now V_e=69.609KeV `
` or v=69.6009KV `
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