# NEET Chemistry The Solid State Questions Solved

The first order reflection (n = 1) from a crystal of the X-ray from a copper anode tube $\left(\lambda =0.154nm\right)$ occurs at an angle of 16.3°. What is the distance between the set of planes causing the diffraction.

(1) $0.374nm$

(2) $0.561\text{\hspace{0.17em}}nm$

(3) $0.274nm$

(4) $0.395\text{\hspace{0.17em}}nm$

(3) From Bragg’s equation, $n\lambda =2d\mathrm{sin}\theta$; $d=\frac{n×\lambda }{2\mathrm{sin}\theta }=\frac{1×0.154}{2\left(\mathrm{sin}\text{\hspace{0.17em}}16.3\right)}=\frac{0.154\text{\hspace{0.17em}}nm}{2×0.281}=0.274nm$

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