Rate of Stimulated emission depends upon the number of atoms present in the excited state as well as the energy density of photons.
The number of atoms present in the excited state is greater than the number of atoms in the ground state is called population inversion.
Simple Harmonic Motion (SHM) is when the restoring force is directly proportional to the displacement of the body from its mean position.
In 1960, Maiman constructed the Ruby laser. It is a three-level solid-state laser and is emitting red light of wavelength 694.3 nm.
Magnetic Hysteresis Curve represents the relation between magnetizing force (H) and magnetic flux intensity for ferromagnetic material.
Total internal reflection is the complete reflection of a ray of light within the medium.
First posulate of Special theory of relativity is "The laws of physics take the same form in all inertial frames".
The phenomenon of Raman scattering of light was experimentally observed in 1928 by Raman and Krishnan.
Heisenberg’s uncertainty principle states that: If the x-component of the momentum of a particle is measured with an uncertainty ∆px, then its x-position cannot, at the same time, be measured more accurately than ∆x = ℏ/(2∆px).
Semiconductors are materials that have conductivity between conductors and insulators.
Thermodynamics is the branch of physics which deals with heat and other forms of energy and also gives relationships between them.
Maxwell’s equations explain the unique co-occurrence of the electric field and the magnetic field.
The effect of magnetic field on the atomic spectral lines is known as Zeeman Effect.
Plasticity is the property of the material by virtue of which it does not regain its original shape when applied force is removed.
Total internal reflection is the complete reflection of a ray of light within the medium.