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The Kbeta X-ray of argon has a wavelengt...

The `K_beta` X-ray of argon has a wavelength of 0.36 nm. The minimum energy needed to ionize an argon atom is 16 eV. Find the energy needed to knock out an electron from the K shell of an argon atom.

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Given lambda=0.36nm `
` E=1242/0.36=3450eV `
` Energy needed to ionize an argn atom =16eV `
Energy needed to knock out an electron from K-shell `
` =(3450+16)eV `
` =3466eV=3.466KeV`
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