# NEET Chemistry The Solid State Questions Solved

The diffraction of barium with X-radiation of wavelength 2.29Å gives a first – order reflection at 30°. What is the distance between the diffracted planes.

(1) 3.29 Å

(2) 4.39 Å

(3) 2.29 Å

(4) 6.29 Å

(3) Using Bragg's equation $2d\mathrm{sin}\theta =n\lambda$

$d=\frac{n\lambda }{2\mathrm{sin}\theta }$, where d is the distance between two diffracted planes, $\theta$the angle to have maximum intensity of diffracted X-ray beam, n the order of reflection and $\lambda$ is the wavelength

$d=\frac{1×2.29Å}{2×\mathrm{sin}{30}^{o}}=2.29Å$     $\left(\mathrm{sin}{30}^{o}=\frac{1}{2}\right)$

Difficulty Level:

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