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Glossary Of Physics Terms
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Balmer lines:Lines in the spectrum of hydrogen atom in visible range, produced by transition between n 2 and n = 2, n is the principal quantum no.
Bar:A unit of pressure, equal to 105 Pascals.
Baryon:subatomic particle composed of three quarks.
Beat:A phenomenon of the periodic variation in the intensity of sound due to superposition of waves differing slightly in frequency.
Bernoulli's theorem:The total energy per unit volume of a non-viscous, incompressible fluid in a streamline flow remains constant.
Beta particle:An electron emitted from a nucleus in radioactive decay.
Binding energy:The net energy required to decompose a system into its constituent particles.
Black body:An ideal body which would absorb all incident radiation and reflect none.
Black hole:The remaining core of a supernova that is so dense that even light cannot escape.
Boyle's law:For a given mass of a gas at constant temperature, the volume of the gas is inversely proportional to the pressure.
Brewster's law:States that the refractive index of a material is equal to the tangent of the polarizing angle for the material.
Brownian motion:The continuous random motion of solid microscopic particles when suspended in a fluid medium due to the consequence of ongoing bombardment by atoms and molecules.
Bulk's modulus of elasticity:The ratio of normal stress to the volumetric strain produced in a body.
Buoyant force:upward force on an object immersed in fluid.

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