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
LED
It is a forward
biased PN junction which emits light when energized. The electrons that are
injected into P-region makes a downward transition from conduction band to the
valence band, and recombine with holes emitting photons with energy equal to
band gap energy.
Lens
It is an optical
device which transmits & refracts light, converging or diverging the beams.
Lenz’s
Law
When an
electromotive force is induced in a conductor by any change in relation between
the conductor and the magnetic field, the direction of electromotive force is
such as to produce a current whose magnetic field will oppose the change.
Lepton
Any Fermion
lighter than Proton is called Lepton.
Lienard
Wiechart Potential
Lienard Wiechart
potentials are magnetic vectors which are used to find radiation from
accelerated charges moving on a specified trajectory path. Relativistic
retarded potentials are called Lienard Wiechart potentials.
Light
The term light is
generally applied to visible light having wavelength in the range of 380nm to
740nm.
Light
Year
Unit of distance
used in astronomy. As defined by International Astronomical Union (IAU), it is
the distance that light travels in vacuum in one Julian year. It equals about
5.88 Trillion miles or 9.46 Trillion kilometers.
Lightening
Conductor
It is originally proposed
by Benjamin Franklin. It is a metallic rod generally attached to roof of
building. A good conducting wire is connected from lightening conductor to the
conductive grid buried in the earth. When lightning strikes, the enormous
current would be driven to ground through conducting wire which offers low
resistance path to ground.
Limiting
Friction
Least force
necessary to set a body in motion.
Linde’s
Process
It is a process of liquefication of gas
which depends on Joule Thomson effect. The Linde’s process is known as
adiabatic expansion of compressed gas.
Line
Spectrum
Hot gases or
vapors in atomic state produce line spectrum. Line spectrum is due to
electronic transition from higher orbits to lower orbits. Line spectrum is
characteristic property of the atom producing light and it differs from one
element to other. Line spectrum is also called ionic spectrum or atomic
spectrum. It consists of bright lines of different colors against dark
background. The intensity of one line is different from other. Line spectrum is
“discontinuous “one.
LINEAC
(Linear Accelerator)
Device/
arrangement to accelerate charged particles like electrons/protons to high
energies of order of MeV. It is an arrangement of lengthy volume containing
multiple tubes called drift tubes whose potential is varied by predetermined RF
oscillator such that the charged particle leaving each tube will leave with
high energy.
Linear
Attenuation Coefficient
If a collimated
beam of mono energetic gamma rays of intensity ‘IO’
passes through a thickness ‘x’ of absorber, the intensity ‘Ix’ of
emerging photons which have not suffered any interaction is given by Ix
= Io e-µx. ‘µ’ is called linear absorption coefficient.
Linear
Energy Transfer
A measure of the ability of biological
material to absorb energy from ionizing radiation, specifically for charged
particles traversing a medium, the energy lost per unit length of path.
Linear
Momentum
Linear momentum
of a body is ability of body to impart motion to other bodies. It is product of
mass and velocity of a body.
Linear
Regression
Linear
regression is a method of estimating or predicting a value of some dependent
variable given the values of one or more independent variables. Like
correlations, statistical regression examines the association or relationship
between variables.
or
Linear
regression refers to fitting a straight line to the data. The fitting is mostly
done using a technique called least square fitting.
Linear
System
A system where
all the interrelationships among the quantities involved are expressed by
linear equations which may be algebraic, differential or integral is called as
linear system.
Liquification
of Gases
Process
of liquefying gas by applying pressure on it at a temperature below its
critical temperature.
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