Bragg's Law - Practice Questions & MCQ

Bragg's law -

X-ray is used in measuring the interplanar spacing 'd' and several informations about the structure of the solid can be obtained. This phenomena can be understand by Bragg's law.

As we have learned the Bragg's law already in Dual nature of matter and radiation, here also these X-rays are diffracted by different atoms and the diffracted rays interfere. In certain directions, the interference is constructive and we obtain strong reflected X-rays. The analysis shows that there will be a strong reflected X-ray beam only if -

$
2 d \sin \theta=n \lambda
$

where n is an integer. For monochromatic X -rays, $\lambda$ is fixed and there are some specific angles $\theta_1, \theta_2, \theta_3, \ldots$ etc. corresponding to $n=1,2,3, \ldots$ etc. in equation given above. Thus, if the X-rays are incident at one of these angles, they are reflected; otherwise they are absorbed.