Defects in Non-Stoichiometric Compounds: The compounds in which the ratio between numbers of anions to number of anions is not equal to ratio indicated by the formula. Metal Excess Defect Metal Deficiency Defect. a. Metal Excess Defect: In these compounds there is an excess of cations along with the electrons occurs. 1. Anion Vacancy: ⇒ Read more about Imperfections in Solids – I[…]
We can now resolve a vector A in terms of component vectors that lie along unit vectors î and ĵ. Consider a vector A that lies in x – y plane as shown in figure. We draw lines from the head of A perpendicular to the coordinate axes as in figure and get vectors A1 Read more about Motion in a Plane[…]
Defects in Crystals: In a perfect crystal all the particles are present at their respective positions. However, no crystal is perfect, every crystal is associated with some deviations. These deviations are called defects (or) imperfections. These are mainly two types. Stoichiometric defects Non- Stoichiometric defects Stoichiometric defects: The compounds in which ratio between number of Read more about Imperfections in Solids[…]
Generally we consider the reference as earth (i.e., stationary) and we will mention the velocities of all the bodies. So it will be relative earth as earth velocity will be “O” its original velocity will be equal to the relative velocity w.r.t earth. But in the relative velocity concept we will speak about the velocity Read more about Relative Velocity[…]
Crystal System: There are 230-crystal forms 32-point groups 7- Crystal systems 14- Bravais Lattice There are seven types of unit cell formed. These are Cubic, Tetragonal, Orthorhombic, Monoclinic, Hexagonal, Rhombohedral or Trigonal and Triclinic. The 7 crystal systems can be remembered as C T O M T R H Crystal System Relation between a, b, Read more about Crystal Lattices and Unit Cells I[…]
Any device removing heat from the cold place and adding it to a hotter place is called a “refrigerator”. It is essentially a heat engine running back-wards. In a heat engine, the working substance takes in heat from a body at a higher temperature, converts a part of it into mechanical work, and gives out Read more about Carnot’s Ideal Refrigerator[…]
Crystal lattice is the depiction of three dimensional arrangements of constituent particles (atoms, molecules, ions) of crystalline solids as points. Characteristics of crystal lattice: Each constituent particle is represented by one point in a crystal lattice. These points are known as lattice point or lattice site. Lattice points in a crystal lattice are joined together Read more about Crystal Lattices and Unit Cells[…]
Consider a plane inclined at an angle θ0 with horizontal. Let a projectile be projected from the foot of the inclined plane A, with velocity v and at an angle as shown in figure. The particle strikes the plane at point B. We want to find the range of projectile on the inclined plane which Read more about Projectile Motion on Inclined Plane[…]
No: of atoms per unit cell: Position of Atoms in the Unit Cell Contribution towards One Unit Cell Corners ⅛ Edges ¼ Face centered ½ Body Centered 1 Primitive cell: 8 atoms at corners So no. of atoms per cell = 8 x ⅛ = 1 Body centered: Total atoms at corners = 8 1 Read more about No: of Atoms per Unit Cell[…]
Consider the equation: s = vₒt + ½ at² … (1) Where the letters have their usual meaning. Since it is meaningless to equate two quantities of different nature, e.g., mass to a length or a temperature to a force, it is evident that for the above equation to have any physical meaning, the three Read more about Principal of Homogeneity of Dimensions[…]