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 7.75o 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. (sin7.75o=0.1349)

(1) 36.88 ×1015J

(2) 27.88×1016J

(3) 63.88 ×1017J

(4) 64.88×1016J

(2) 2dsinθ=nλ

λ=2dsinθ=2×2.64×1010×sin7.75o=0.7123×1010m

E=hcλ=6.62×1034×3×1080.7123×1010=27.88×1016J  

expansion, electrical and thermal conductivities etc. is different in different directions, with in the crystal

 

Difficulty Level:

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