The number of atoms present in the excited state is greater than the number of atoms in the ground state is called population inversion.
Physics
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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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Magnetic Hysteresis Curve represents the relation between magnetizing force (H) and magnetic flux intensity for ferromagnetic material.
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Total internal reflection is the complete reflection of a ray of light within the medium.
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First posulate of Special theory of relativity is “The laws of physics take the same form in all inertial frames”.
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Most solid materials show elastic behaviour to a lesser or greater extent.
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Plasticity is the property of the material by virtue of which it does not regain its original shape when applied force is removed.
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Quantum mechanics is dealing with the behaviour of matter and light on the atomic and subatomic level.
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Undergoing deformation following two terms describe the forces on objects. Stress and strain.