Definition: Insulators, Semiconductors & Conductors
Insulators:
In an insulator, the forbidden energy gap is very large. In general, the forbidden energy gap is more than 3eV and almost no electrons...
Energy bands in conductors
The lower completely filled band is called valence band and the upper empty band is called conduction band. The gap between the top of...
Energy band in solids
In solids, the atoms are arranged in a systematic space lattice and each atom is influenced by neighbouring atoms. The closeness of atoms results...
Classification of Metals, Conductors and Semiconductors
On the basis of conductivity: On the basis of the relative values of electrical conductivity (σ) or resistivity (ρ = 1/σ), the solids are...
Nuclear Energy
Nuclear Energy
Energy then can be released if less tightly bound nuclei are transmuted into more tightly bound nuclei. Two such processes, which we have...
Binding energy per nucleon
As, some mass disappears in the formation of a nucleus in the form of mass defect. This loss in mass reappears in the form...
Gamma Radiations and Gamma decay
Gamma Radiations:
There are energy levels in a nucleus, just like there are energy levels in atoms. When a nucleus is in an excited state,...
Beta Particles and Beta Decay
Beta Particles:
A nucleus that decays spontaneously by emitting an electron or a positron is said to undergo beta decay. Like alpha decay, this is...
Alpha Particle and Alpha Decay
Alpha Particle:
Alpha particles are helium nuclei of nuclear origin. It carries 2 unit positive charges and its mass is about four times the mass...
Radioactivity
Radioactivity was discovered by A.H. Becquerel 1896 accidently.
Radioactivity was a nuclear phenomenon in which an unstable nucleus undergoes decay. This is referred to as...