use of quantum mechanics

Quantum Mechanical Model of the Atom - Two new theories came to substantially modify Bohr's Atomic model. They a..

Two new theories came to substantially modify Bohr's Atomic model. They a..

In this, the patient lies down surrounded by massive electromagnets and is exposed to short bursts of powerful magnetic field and waves. These bursts stimulate the protons (hydrogen nuclei) of the patients tissues to emit radio signals which are picked up and converted into digital signals. These ..

Quantum Theory of Covalent Bond - Although the Lewis structures give an idea of the valence electrons around the atom, in reality it does not precisely locate the position of the electrons in the chemical bond. The behaviour of electrons in molecules and compounds is made by the valence b..

Principal Quantum Number (n) - This quantum number determines the main energy level or shell in which an electron is present. It is usually denoted by n and can have any whole number value such as: n = 1, 2, 3, 4 .. etc. The various values of n as 1, 2, 3, 4 .etc., are also call..

This involves removal of weeds by pulling them out (uprooting) with hand, removal of weeds by using a hoe or trowel, interculture, ploughing, burning and floodin..

The process of electrolysis is exactly opposite to one that takes place in a voltaic cell. A voltaic cell or a battery uses its chemical energy to produce electrical energy. While in electrolysis, electrical energy is used to bring about a chemical change. Humphrey Davy (1807) s..

Renin is present only in young children. It digests the milk protein, casein. Casein is hydrolysed into paracasein which gets precipitated as insoluble calcium paracaseinate. This is called coagulation. Renin secreted by the gastric mucosa of the calf is extracted to make rennet tablets ..

In this type of contraception, a physical barrier is placed to prevent the entry of sperms into the uterus. It includes condoms (such as Nirodh) used by males, intrauterine device (IUD) and diaphragm cap used by females. IUD is commonly called loop and is inserted by a doctor..

When the (+) and (-) isomers or their salts form well defined crystals showing hemihedral faces, hand picking is used to separate them. Pasteur separated sodium ammonium racemate crystals by mechanical separation in 1848. Below a certain temperature the enantiomorphs crystalliz..