Physics
Definitions
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| Critical
Temperature : There are metals and compounds whose resistively
goes to zero below a certain temperature Tc called
critical temperature. |
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| Cross
Field : If a uniform electric field and a uniform magnetic
field are perpendicular to each other in such a way that they
produce deflections of a charged particle in the opposite
direction, they are known as cross fields. |
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| Conductors
: Those materials whose electrical conductivity is very
high are called conductors. e.g. copper, silver, aluminum etc.
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| Conductivity
: The reciprocal of resistively of a conductor is called
its conductivity.It is denoted by the symbol σ. If a
conductor has resistively ρ, then its conductivity is
given by; σ = 1/ρ. |
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| Cylindrical
Wavefront : When the source of light is linear, all the
points equidistant from the linear source lie on the surface
of a cylinder. Such a wavefront is called a cylindrical
wavefront.
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| Coherent
Sources : Two sources of light which emit continuous light
waves of the same frequency, same wavelength and have zero
phase difference or constant phase difference at all times
are called coherent sources. |
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| Continuous
spectra : The spectra which consist of continuous range
of wavelengths are called continuous spectra. |
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| Chain
Reaction : The nuclear fission which once started continues
till all the atoms of the fissionable material are disintegrated
is known as chain reaction. |
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| Crystalline
: Solid whose constituent particles (atoms or ions or
molecules) are arranged in an orderly fashion throughout in
a three-dimensional pattern are called crystalline solids
e.g. NaCI, KCI, sugar, diamond etc. |
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| Crystallographic
Axes : The lines drawn parallel to the lines of intersection
of any three faces of the unit cell which do not lie in the
same plane are called crystallographic axes. |
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| Crystal
Lattice : A three-dimensional array of points showing
how constituent particles are arranged in a crystal is known
as crystal lattice. |
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| Crystal
System : The different possible geometrical shape of crystal
lattice are called crystal system. |
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| Conduction
Band : The range of energies i.e. band possessed by conduction
band electrons is known as conduction band. |
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