question_answer

WH Bragg pointed out that the scattering of X-rays by crystals could be considered as reflection from successive planes of atoms in the crystals. Which of the following equation represents Braggs equation?

A)  \[\operatorname{n}\lambda \,\,=\,\,2\,\theta \,\,sin\,\,\theta \]        

B)  \[\operatorname{n}\lambda \,\,=\,\,d\,\,sin\,\,\theta \]

C)  \[\operatorname{n}\lambda \,\,=\,\,2d\,\,sin\,\,\theta \]     

D)  \[\operatorname{n}\frac{d}{2}\,\,=\,\,\lambda \,\,sin\,\,\theta \]