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# What is bragg's law and why do we use it???

Mukesh Sharma
askIITians Faculty 43 Points
7 years ago
when x-rays are scattered from a crystal lattice, peaks of scattered intensity are observed which correspond to the following conditions:

The angle of incidence = angle of scattering.

The path length difference is equal to an integer number of wavelengths

That is n *lambda=2dsintheta called braggs law
we use it to find the structural details of a crystal, if crystal structure is known we can find the wavelength by using bragg's law

Thanks & regards

Mukesh Sharma

M.sc, Jiwaji university , Gwalior

askiitian expert Rahul iitd
askIITians Faculty 10 Points
7 years ago
Bragg's law gives the condition of strong reflection of the X rays when they are made to diffract from soild crystals. It is given as
$n\lambda = 2d\sin\theta \,,$
Where
d = interplanar distance of the crystal
? = Angle made by X ray beam with the planes
? = Wavelength of X ray
n = integer
We get different angles corresponding to different n for one wavelength.
It is used to get information about the crystals like interplanar spacing and other information about the structure of the solid.

Thanks and Regards
Rahul kumar