Notes Relativistic Hamiltonian for charged particle in external electromagnetic field The relativistic Hamiltonian for a charged particle moving in an external electromagnetic field is derived from the Dirac equation, which is the relativistic quantum mechanical equation describing …

Notes Physical Significance of Hamiltonian The Hamiltonian in classical and quantum mechanics is a mathematical object that encodes the total energy of a physical system. It plays a central role in determining the time evolution ...

Notes Statistical mechanics Microscopic System: A system of atomic dimension or of smaller size is called microscopic system. Eg: a moleculeMacroscopic System: A system which is large enough to be observable ...