Tangential
Stress
When a tangential
force is applied on a body such that there is a change in shape of the body
only, then the tangential force per unit area is called tangential stress.
Telescope
An arrangement of
lenses and mirrors that collects visible light, allowing direct observation or
photographic recording of distant objects is called as telescope. A refracting
telescope uses lenses to focus light to produce a magnified image. Compound
lenses are used to avoid distortions such as spherical and chromatic
aberrations. A reflecting telescope uses mirrors to view celestial objects at
high levels of magnification. Most large optical telescopes are reflecting
telescopes because very large mirrors, which are necessary to maximize amount of
light received by telescope, are easier to build than very large lenses.
Temperature
of Inversion (Gases)
The temperature
of a gas is the temperature below which a gas is cooled in Joule Thomson
expansion and above which gas is heated. In other words, the temperature at
which sign of Joule Thomson effect gets reversed.
Temperature
Degree of hotness of a body
Temporal
Coherence
The coherence
with time in the waves from coherent source travelling in one path is called
temporal coherence.
Tensile
Strain
If there is increase in length of object
due to application of longitudinal stress then it is called tensile strain.
Tensile
Strength
The maximum stress, in tension, that may be
sustained without fracture.
Tensor
Analysis
The study of the
fact that “the fundamental laws of physics should possess the same form in all
coordinate systems” known as invariant formulation of physical laws is embodied
in “Tensor analysis”. Tensor analysis is generalization of vector analysis.
Tephigram
It is the name given for temperature-Entropy
diagram. It is useful for applications of meteorology, work value of fuel etc.
Terminal
Velocity
The maximum velocity which a body attains
when its falls through air under gravitational force.
Terrestrial
Radiation Sources
This type of radiation
is present in small quantities all around us and is more or less in escapable. The
main source of terrestrial radiation is the element uranium and its decay products
such as thorium, radium, and radon. Although the overall natural concentration
of these radioactive materials is within the tolerable range of humans, some parts
of the world have been identified where higher levels of uranium and thorium in
surface soil have increased the radiation to dangerous levels. The two isotopes
of radon, 222Rn and 220Rn, and their daughter products
are the most commonly found hazardous radioactive elements in our surroundings.
The main cause of concern with respect to these α-emitting isotopes is their
inhalation or digestion, in which case the short range α-particles continue to
cause damage to internal organs that can lead to cancer.
Tesla
The SI derived unit of magnetic flux
density, equal to the magnitude of magnetic field vector necessary to produce a
force of one Newton on a charge of one Coulomb moving perpendicular to
direction of magnetic field vector with a velocity of one meter per second. It
is equivalent to one Weber per square meter.
Thermal
Conductivity (Insulator)
When one part of
crystal is heated, a temperature gradient is set up. In the presence of
temperature gradient, heat will flow from the hotter to cooler region. The
ratio of this heat current density to the magnitude of temperature gradient is
called thermal conductivity.
Thermostat
Thermostat is a
device used to maintain steady temperature. It is equipped with bimetallic
strip.
Theory
of Everything
Hypothetical theory aimed at single
equation comprising four types of interactions.
Thermal
Capacity
The quantity of
heat energy required raising the temperature of a given mass of a substance by
1oC or 1oK is called thermal capacity.
Thermal
Equilibrium
When
the temperature in all parts of system is same as that of surroundings, the
system is said to be in thermal equilibrium.
or
Whenever
there is no exchange of heat between the bodies, the bodies are said to be in
thermal equilibrium.
Thermal
Evaporation Method
It is a thin film growing technique. The
principle involves heating the substance more than its melting point in order
to produce vapors of it to get deposited on substrate.
