Simple Harmonic Motion (SHM) is when the restoring force is directly proportional to the displacement of the body from its mean position.
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The number of atoms present in the excited state is greater than the number of atoms in the ground state is called population inversion.
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Rate of Stimulated emission depends upon the number of atoms present in the excited state as well as the energy density of photons.
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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.
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Magnetic Hysteresis Curve represents the relation between magnetizing force (H) and magnetic flux intensity for ferromagnetic material.