logging in or signing up bragg's law...tabish ansari mohammadi242 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 427 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: February 27, 2011 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Slide 2: PRESENTATION OF PHYSICS ON BRAGG’S LAW: BY MD. TABISH ANSARI 1000310033 SEC-B C.S SUMITTED TO D.N. MISHRASlide 4: English physicists Sir W.H. Bragg and his son Sir W.L Bragg in 1913... carefully planed a technique for the study of diffraction of X-rays by considering the scattering of X-Rays by the atoms in the crystal lattice… that is known as…Slide 5: Bragg ‘s LawSlide 6: Ray diagram of Bragg’s lawSlide 7: A narrow beam of monochromatic X-Ray of wavelength( λ ) be incident on planes in crystal at a glancing angle ( Θ ) These rays are scattered by the atom like B and B’ of two adjacent planes of separation ‘d’.Slide 8: The following condition to verify the Bragg’s Law- 1. Angle of incident = Angle of scattering 2. The path difference is equal to an integral multiple of wave length. i.e n λ = 2 d sin ΘConstruction: Construction Here BM and BN are perpendicular drawn from B. then the path difference b/w A and A’ is equal to… MB‘ + B’NPath Difference: Path Difference Path diff. = MB’ + B’N = d sin Θ + d sin Θ = 2d sin Θ for constructive pattern, the path diff. is integral multiple of wavelength ( λ ) i.e 2d sin Θ = n λSlide 11: Daigram of Bragg’s spectrometerSlide 12: Much of our knowledge about crystal structure and the structure of molecules as complex as DNA in crystalline form comes from the use of x-rays in x-ray diffraction studies.Slide 13: A basic instrument for such study is the Bragg spectrometer .Slide 14: To obtain nearly monochromatic x-rays, an x-ray tube is used to produce characteristic x-rays . matched filters are used in the x-ray beam to optimize the fraction of the energy. WORKINGSlide 15: Such filters use elements just above and just below the metal in the x-ray target, making use of the strong "absorption edges" just above and below the K-alpha energy of the target metal.Slide 16: The x-rays are collimated with apertures in a strong x-ray absorber and the narrow resulting x-ray beam is allowed to strike the crystal to be studied.Slide 17: The spectrometer arrangement couples the rotation of the crystal with the rotation of the detector so that the angle of rotation of the detector is twice that of the crystal.Slide 18: This satisfies the conditions of Bragg's law for diffraction of the x-rays from the crystal lattice planes. Graph: GraphSlide 20: The first Spectrometer Another rays diagram spectrometer: Another rays diagram spectrometerSlide 22: bye bye & thanks to all of you You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.