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
Translucency
It is the property of the substance
transmitting light only diffusively; objects viewed through a translucent
medium are not clearly distinguishable.
Transmission
Electron Microscopy
The image seen
with TEM is formed by electron beam that passes through specimen. Details of
internal microstructure features are accessible to observation; contrasts in
the image are produced by differences in beam scattering or diffraction
produced between various elements of microstructure or defect. Since solid
materials are highly absorptive to electron beams, a specimen to be examined
must be prepared in the form of very thin foil; this ensures transmission
through specimen of an appreciable fraction of incident beam. The transmitted
beam is projected onto a fluorescent screen or a photographic film so that the
image may be viewed. Magnifications approaching 106 times are possible with
TEM, which is frequently utilized in study of dislocations.
Transmission
It is property of a substance to permit the
passage of light, with some or none of the incident light being absorbed in
process.
Transmitting
Power
The
ratio of amount of radiations transmitted by a body in a certain time to amount
of radiations incident on it in the same time is called transmitting power.
Transverse
Wave Motion
Type of wave motion in which particles of
medium vibrate at right angles to direction of propagation of wave.
Triple
Point
The temperature
and pressure combination for a substance at which liquid vapor curve, fusion
curve and sublimation curve coincide. It is the combination at which substance
coexists in solid, liquid and vapor phases.
Triton
Nucleus of Hydrogen-3
(1H3 ) atom, consists of one proton and two neutrons
bound together with a total binding energy of 8.48 Mev. The H-3 atom, a
radioactive isotope of hydrogen with a half life ty2 of 12.32 yrs, is called as Tritium and
consists of a nucleus and one electron.
Tropopause
The boundary between the troposphere and
the stratosphere is called the "tropopause", located at an altitude
of around 5 miles in the winter, to around 8 miles high in the summer, and as
high as 11 or 12 miles in the deep tropics.
Troposphere
The troposphere is the lowest major
atmospheric layer, extending from the Earth's surface up to the bottom of
the stratosphere.
The troposphere is where all of Earth's weather occurs. It contains
approximately 80% of the total mass of the atmosphere. The troposphere is
characterized by decreasing temperature with height (at an average rate of 3.5 oF
per thousand feet, or
6.5 oC per kilometer).
Trough
The trough of a wave is the point at
which particle has maximum amount of negative or downward displacement from the
rest position.
Tuning
Fork
Arrangement of U–shaped rod attached to
metal stem, used as a source of standard frequency. It is made of an alloy of
Nickel and steel.
Tunnel
Diode
A tunnel diode is
a P-N junction where both P-and N-type regions are degenerately doped. As a
result, the Fermi level in the N-type material is above the minimum of the
conduction band and the Fermi level in the P-type material is below the maximum
of the valence band. The doping concentrations are so high that the width of
the space-charge region at the junction is extremely thin, and usually measures
less than 10nm. The diode exhibits negative resistance characteristics.
Twin
Boundaries
A twin boundary
is a special type of grain boundary across which there is a specific mirror
lattice symmetry; that is atoms on one side of boundary are located in mirror
image positions of atoms on the other side. The region of material between
these boundaries is approximately termed as a twin.
Twin
Paradox (Relativity)
It is well known
hypothetical concept in relativity under time dilation. As per this concept,
one of two twins remains at rest and other moves in space ship moving with
nearly velocity of light for some duration and come back. Applying theory of
relativity, age of twin in space shuttle appears to be high. This leads to
paradox.
Type-I
Superconductor
Superconductor
which exhibits complete Meissner effect for magnetic fields up to a limit is called
critical magnetic field.
Type-II
Superconductor
This type is discovered by Schubikov. Superconductor which exhibits Meissner effect till a particular magnetic field range, beyond which admits magnetic flux but retains zero resistance till a particular field value (critical field II) beyond which settles to normal state.
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