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POPULATION INVERSION and LUMINOUS FLUX:
POPULATION INVERSION: The process in which number of electrons (N ) in a higher2 energy state called metastable state of an active medium is increased to a value greater than the number (N ) in the ground state (i.e. N > N ) is called population inversion.
LUMINOUS FLUX : The amount of radiant (light) energy following from a source of light per unit time is called luminous flux or light flux (Φ) . It is measured in lumens.
LUMINOUS INTENSITY : Luminous intensity of a point source of light is defined as the luminous flux emitted from it per unit solid angle.
It is otherwise called Illuminating power (I). It is measured in candela (cd).
Drake equation (F. Drake; 1961) A technique of estimating the number of intelligent, technological species (that means, able to communicate along with other species) in existe
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Radioactive Decay Series The sequential decay of a given nucleus results in the production of a series of nuclei or elements. This series of elements thus formed is known as a
neutral point of bar magnet
Brewster's law (D. Brewster) The extent of the polarization of light reflected through a transparent surface is maximum while the reflected ray is at right angles to the refra
Measurement of length: If the Zeroth division of the head scale does not coincide with the index line the Screw gauge has Zero error. If the Zeroth division of the head Sca
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what is cruisiing mean
Q. Illustrate what are the weights in pounds of liquid gallons? Answer:- First you should know the specific gravity of the liquid then you can compute the weight by multip
Static Electricity: 1. There are two types of charges positive and negative. 2. Like charges repel and unlike charges attract each other. 3. Charged bodies make electric
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