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When an electron in an excited state of ...

When an electron in an excited state of Mo atoms falls from L to K-shell , an X-ray is emitted. These X-rays are diffracted at angle of `7.75^(@)` by planes with a separation of `2.94 Ã…`. What is the difference in energy between k-shell and L-shell in Mo, assuming of first order diffraction ? ( `sin 7.75^(@)=0.1349`)

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