Question

Derive bragg's equation

Answer 1

Bragg's Equation

This equation gives a simple relationship between the wavelength of X-rays and the distance between the planes in the crystal and the angle of reflection. The equation may be written as:



 

where n = order of reflection; in general it is taken as  = wavelength of X-rays, d =

distance between two layers of the crystals and  =angle of incident light.

Example 1:

Inter planar distance between two layers is  in a crystal. Calculate the angle of reflection for first order reflection. X-rays of wavelength  are diffracted by the crystal.



Answer 2

the difference between the constructive interference of two scattered beams which must be an integer multiple of electron wavelength
n/, ( lamda ) is the Bragg equation and the path difference between electrons scattered from adjacent Crystal is 2dsin0