Notes Crystal Defect The imperfection in the solid due to the deviation from the periodicity of the crystal is called crystal defect.1. Point defect/ Lattice vacancy: The defect in the crystal that ...

Notes Bloch theorem Bloch theorem is a fundamental result in the theory of solids that describes the behaviour of electrons in a periodic potential, such as the crystal lattice of a solid. The ...

Notes Theory of Plasma oscillation If the electron in a plasma are displaced from a uniform background of ions, electric field will be built up in such a direction as to restore the neutrality of ...

Notes Doppler effect in light When there is relative motion between source and observer, there is apparent change in frequency of wave which is called Doppler's effect. In the case of light waves, the Doppler ...

Notes Jeans instability In the interstellar model, molecular clouds are the sites of star formation. Clouds must be in hydrostatic equilibrium for stability, which requires that internal pressure be in equilibrium with …

Notes Flux quantization in a superconducting ring Flux quantization is a fundamental property of superconducting rings, which is a consequence of the Meissner effect. When a superconducting ring is placed in a magnetic field, the magnetic field ...

Notes Double well levels For the double well potential, the WKB approximation can be applied separately in each well and in the barrier region between the wells. The resulting energy levels depend on the ...

Notes Relativistic Lagrangian for a charged particle in electromagnetic field. The Lagrangian describes the dynamics of the system and is used in the Lagrangian formulation of classical mechanics to derive the equations of motion of the particle. The principle of ...