readbud - get paid to read and rate articles

March 17, 2010

behind the physics : x-rays and XRD

when electrons were accelerated by a high voltage in vacuum tube and allowed to strike or metal surface inside the tube, fluorescent mineral some distance away would glow and photographic film would become expose. this called X-rays which typically used voltage in range 30kV - 150kV.
Experiment show that x-rays not be defected by electric or magnetic fields and hence indicated that they were not charged particle. They also not show diffraction or interference effects using ordinary grating (grating spacing of 10 micrometer). Max Von Laue suggested that if the atoms in a crystal were arranged in a regular array, such a crystal might serve as a diffraction grating for a very short wavelength in order spacing between atom approximately 10 amstrong.
Experiment also show that x-rays scattered from a crystal did indeed show the peak and valleys of diffraction pattern. Thus, it was shown that x-rays have a wave nature and that the atom are arranged in a regular way in crystal. Nowadays, x-rays known as electromagnetic radiation

No comments:

Post a Comment

Related Posts with Thumbnails
Related Posts with Thumbnails