1.

When an electron in an excited Mo atom fall 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 2.64overset(@)A. What is the difference in energy between K-shell and L-shell in Mo assuming a first-order diffraction (sin 7.75^(@)=0.1349)

Answer»

`36.88xx10^(-19)J`
`27.88xx10^(-16)J`
`63.88xx10^(-17)J`
`64.88xx10^(-16)J`.

SOLUTION :`2d sin theta=n lambdarArrlambda=2d sin theta=2xx2.64xx10^(-10)xxsin7.75^(@)`
`=0.7123xx10^(-10)m`
`E=(HC)/(lambda)=(6.62xx10^(-34)xx3xx10^(8))/(0.7123xx10^(-10))=27.88xx10^(-16)J`


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