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)`A. `36.88xx10^(-19)J`B. `27.88xx10^(-16)J`C. `63.88xx10^(-17)J`D. `64.88xx10^(-16)J`.

When an electron in an excited Mo atom fall from L to k shell, an X -r

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)`A. `36.88xx10^(-19)J`B. `27.88xx10^(-16)J`C. `63.88xx10^(-17)J`D. `64.88xx10^(-16)J`.
Answer» Correct Answer - B `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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