# NEET Chemistry The Solid State Questions Solved

When an electron in an excited Mo atom falls from L to the K shell, an X-ray is emitted. These X-rays are diffracted at angle of $7{.75}^{o}$ by planes with a separation of 2.64Å. What is the difference in energy between K-shell and L-shell in Mo assuming a first-order diffraction. $\left(\mathrm{sin}7{.75}^{o}=0.1349\right)$

(1) 36.88 $×\text{\hspace{0.17em}}{10}^{-15}J$

(2) $27.88×{10}^{-16}J$

(3) 63.88 $×{10}^{-17}J$

(4) $64.88×{10}^{-16}J$

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