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DIFFRACTION BY SOLIDS
Diffraction performs when a wave interacts with a lattice whose dimensions are of the same order of magnitude as that of the wavelength of the waves. The lattice scatters the radiation, and the scattered radiation from one point interferes with the radiation from others so as to either reduce it (destructive interference), or enhance the amplitude of the radiation (constructive interference). The pattern of destructive and constructive interference yields information about molecular and crystal structure.
Fig.1. Constructive (a) and destructive (b) interference of two
waves.
In the case of solids, this wavelength must be of the same order as the crystal lattice spacing (ca. 0.1nm), and there are three primary types of radiation which are used for structural studies of solids. The most commonly used radiation, X-rays, have wavelengths of the order of 0.15 nm, and in the course of diffraction studies are scattered by the electron density of the molecule.
Alum is a chemical (aluminum potassium sulphate) it tends to be whitish powder with various uses.
Viscosity: Viscosity characterizes the motion of fluids in the presence of a mechanical shear force. All fluids can flow, and the resistance they pose to such flow is called VI
standard estimation protocol
account for the effects of solvents on the wavelength of absorption of the acetone in terms of the hydrogen bonding properties of the solvent used
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Show that wavefunction ψ1(x) = (2/L) 1/2 sin(πx/L) of a particle in a box is an eigenfunction of the operator d 2 /dx 2 and also calculate the corresponding eigenvalue.
the diagnal relationship in periodic table
giving correct formulas give the reactantsand products in the formation of poly2 butane
Osazone Formation - Test of Glucose Glucose on heating along with excess of phenyl hydrazine in acetic acid provides a yellow crystalline substance, m.pt. 205 ° C.
describe the comparative study of physical and chemical properties of p block elements.
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