The wave mechanical model of atom comes from wave equation. The wave equation describes the electron in motion as a three dimensional wave. This was given by Schrodinger x, y, z are Cartesian coordinates m is mass of electron. V is potential energy of electron E is total energy of electron h is Planck’s constant. Read more about Quantum Mechanical Model[…]
EQUALITY OF MATRICES DEFINITION: Two matrices A = [aij] mxn And B = [bij] mxn are said to be equal if 1. m = r, i.e., the number of rows in A equals the number of rows in B 2. n = s, i.e., the number of columns in A equals the number of columns in B 3. aI Read more about Algebra of Matrices of Order 2 and 3[…]
The principle states that “when a body is partially or completely immersed in a fluid, it experiences a buyont force (upthrust) due to which it appears lighter, the apparent loss in the weight of body is equal to the weight of the liquid displaced”. Proof of Archimedes’ Principle: Consider a cubical block ABCDEFGH of face Read more about Archimedes’ Principle[…]
Definition: A set of mn numbers (real or imaginary) arranged in the form of a rectangular array of m rows and n columns is called an m x n matrix (to be read as ‘m’ by ‘n’ matrix). An m x n matrix is usually written as . In compact form the above matrix is Read more about Types of matrices[…]
Bohr’s atomic Theory It is based on the application of quantum theory of radiation. Postulates:- 1. The electrons revolve around the nucleus with definite velocity in certain fixed closed paths called orbits. There are numbered as 1, 2, 3, 4…… (Or) K, L, M, N from the Nucleus. 2. The angular momentum of electron is an Read more about Bohr’s Atomic Theory[…]
Let A and B be two non-empty sets. Then a function ‘f’ from set A to set B is a rule or method or correspondence which associates elements of set A to elements of set B such that i) All elements of set A are associated to elements in set B. ii) An element of Read more about FUNCTIONS[…]
Typical particle (at a point P) of the rigid body rotating about a fixed axis (taken as the z – axis). The particle describes a circle with a centre C on the axis. The radius of the circle is r, the perpendicular distance of the point P from the axis. We also show the linear Read more about Angular Velocity and its relation with linear velocity[…]
“It is not very difficult to crack JEE exam if you plan your studies properly. 1. The syllabus is huge; hence start preparing few months before the exam. 2. Refer good books. 3. Go through previous papers to understand the format of the paper. 4. Practice and revise. “You have to regularly give mock tests Read more about IIT Tips & Tricks[…]
A long time ago there was a boy. He was smart, talented and handsome. However, he was very selfish and his temper was so difficult, that nobody wanted to be friends with him. Often he got angry and said various hurtful things to people around him. The boy‘s parents very concerned about his bad temper. Read more about A LONG TIME AGO THERE WAS A BOY…[…]
Thomas Edison tried two thousand different materials in search of a filament for the light bulb. When none worked satisfactorily, his assistant complained, “All our work is in vain. We have learned nothing.” Edison replied very confidently, “Oh, we have come a long way and we have learned a lot. We know that there are Read more about Learning from Mistakes[…]