A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Einstein
It is unit of
energy used in photo chemistry. One Einstein is energy per mole of photons
carried by a beam of monochromatic light.
One Einstein= 3.99 x 10-10 ν, Joules per mole; ν is frequency
Einstein’s
Mass-Energy Relation
The total energy
of a moving body is equal to relativistic mass times the square of speed of
light. E=mc2; ‘m’ is mass of body in motion; m= mo/sqrt(1-v2/c2);
m0 is rest mass of body; C is velocity of light.
Elastic
Collision
It is the type of
collision in which both the momentum & kinetic energy are conserved and
colliding bodies do not undergo any deformation.
Elastic
Deformation
The deformation
in which stress and strain are proportional is called elastic. In such a
deformation, when applied load is released, the substance returns to original
shape.
Elastic
Fatigue
The state of temporary
loss of elastic nature of a body due to repeated stress over a long time
interval is called as elastic fatigue.
Elastic
Limit
When the strain is increased slightly
beyond proportionally limit in a wire, the stress is not proportional to strain.
However the wire exhibits elastic property. When deforming force is removed,
wire regains natural wavelength. This is called elastic limit.
Elasticity
It is the
property of a body by virtue of which it tends to regain its original size and
shape after removal of deforming forces.
Elastomer
A polymeric
material that may experience reversible elastic deformation.
Electret
The word is first
coined by Oliver Heaviside in 1885. It is derived from words electricity
(electr) and magnet (et). It is dielectric material that has a quasi permanent
electric charge or dipole polarization.
Electric
Current
It is the amount
of charge flowing through a particular area in unit time
Electric
Field
There
exists a region around any charge, filled with imaginary lines of force. The
electric field is defined as force acting on any test charge placed in that
region.
(or)
It
is defined as torque exerted on test dipole placed in that region.
Electric
Potential
Potential energy
which a unit charge would have, if brought to a specified point in space from some
reference point.
Electric
Susceptibility
It is
proportional constant between microscopic property “polarization” and
macroscopic property “electric field”.
Electrical
Discharge
It results from
creation of conducting path between two points of different electrical
potential in the medium, in which the points are immersed. Usually the medium
is gas. It occurs when potential difference is very high.
Electricfield
Intensity
Physical quantity
used to measure strength of electric field in the space around a charged
object. It is defined as force per unit charge placed at a point in the
field.
Electrodeposition
It is also known
as electroplating. It is the process of depositing material on to conducting
surface from a solution containing ionic species, by passing electric current.
Electroluminescence
The phenomenon in which electric energy can be used to generate photoemission in a solid is known as electro luminescence.
