Bragg's Law and its aplications by AZ

I hope this ppt will help you a lot while learning Bragg's Law and its applications. It is not too much complicated i think and it will lead to easy understanding regarding Bragg's Law. If you faced any difficulty in this ppt you can contact me via my email address . This is my first ppt that i am sharing with SlideShare.

1. BRAGG’S LAW & ITS APPLICATIONS Presented By: AHMAD ZAHID Enrollment No: 1517CUKmr029 DEPARTMENT OF PHYSICS CENTRAL UNIVERSITY OF KASHMIR

2. Who was W.L. Bragg?

3. Bragg’s Law says that: nλ =2d hkl sinθ hkl where n is an integer, λ is the wavelength of the X-rays, d hkl is the spacing of the ( hkl ) planes and θ hkl is the diffraction angle for this set of planes. Therefore above mathematical relation says that radiation of wavelength λ which is incident on a series of planes with periodic spacing d, will be diffracted through an angle θ .

4. For the derivation of Bragg’s Law, lets watch this video

5. Applications of Braggs Law: Solving Bragg's Equation gives the d-spacing between the crystal lattice planes of atoms that produce the constructive interference. A given unknown crystal is expected to have many rational planes of atoms in its structure . In X-ray diffraction (XRD) the inter-planar spacing (d-spacing) of a crystal is used for Identification and characterization purposes.

6. (To be contd.) Computed Tomography (CT) uses many X-ray slices at different angles to build up three dimensional images inside the body with the help of Bragg’s law . Ultrasound uses echoes from sound waves to locate different organs inside the body ,and can be used to monitor the growth of unborn babies .

7. (To be c ontd.) Magnetic Resonance Imaging (MRI, or NMR) uses powerful magnets to measure the water content of different types of body tissue. It is a slow process, but generates incredibly detailed images of the body. Positron Emission Tomography (PET) detects radioactive tracers that are injected into the body and Electroencephalography (EEG) detects electrical activity in the brain.

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