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Quantum number

A quantum number describes the energies of electrons in atoms. Each quantum number specifies the value of a conserved quantity in the dynamics of the quantum system. Since any quantum system can have ... > more
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In mathematics, an ellipse is a plane algebraic curve where the sum of the distances from any point on the curve to two fixed points is constant. An ellipse can be drawn with two pins, a loop of ... > more
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Luminosity

In general physics, luminosity (more properly called luminance) is the density of luminous intensity in a given ... > more

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