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
Thomson
Thermo-Electric Effect
It is the
designation of the potential gradient along a conductor which accompanies a
temperature gradient, the magnitude and direction of potential varies with
substance. The coefficient of Thomson effect or specific heat of electricity is
expressed as joules per coulomb per degree centigrade.
Thorium
Series
A radioactive decay series which begins
with thorium of mass number 232 and ends with non–radioactive isotope of lead
of mass number 208.
Thyrsitor
The thyristor is
a four-layered, three terminal semiconducting device, with each layer
consisting of alternately N-type or P-type material. It has two stable states, and used as an
electronic switch.
Time
Dilation
One of
consequences of theory of relativity which says that “A moving clock always
appears to go slow “. “ Every clock appears to go at its fastest rate when it
is at rest relative to the observer. Its rate appears to go on slowing by a
factor sqrt[1-v2/c2)]
as its velocity ‘v’ relative to observer goes on increasing. Where ‘v’ is velocity of observers frame
relative to reference frame in which clock is placed.
Time
Period
Length
of time it takes a particle to make one oscillation
or
Time
taken by particle in a wave to complete one vibration.
Time
Time is presence of motion and forces in
universe. Time is a real phenomenon which changes continuously. It is measured
by comparison to other motions.
Tisza’s
Two Fluid Model
According to this hypothesis, liquid Helium
consists of two independent components normal fluid and super fluid. The normal
fluid has energy in excess of zero point energy and behaves as an ordinary
liquid and possess no unusual properties except that it is liquid at low temps
and the super fluid possess only zero point energy, zero entropy, zero viscosity.
Tone
When a musical instrument produces sound of a
single frequency, it is called as tone.
Torque
The
moment of a force; the measure of force’s tendency to produce torsion and
rotation about an axis, equal to vector product of radius vector from axis of
rotation to the point of application of force and the force vector.
Total
Energy Density
Total energy
density of radiation at a point is equal to the total radiant energy enclosed
per unit volume around that point for all wavelengths.
Total
Internal Reflection
When angle of
incidence of a ray travelling from denser to rarer medium is greater than the
critical angle, no refraction occurs. The incident ray is reflected back in
same medium. The phenomenon is called as total internal reflection.
Toughness
It is measure of
ability of a material to absorb energy up to fracture point.
Transducer
A device which converts energy from one form
to another. For instance, a loud speaker is a transducer that transforms
electrical signals into sound energy.
Transformer
It is an AC static device that transfers
electric power from one circuit to another. It raises or lowers the voltage in
a circuit but with a corresponding decrease or increase in current.
Transient
Equilibrium
The parent and
daughter radioactive nuclides can also exist in a transient state of
equilibrium in which their activities are not equal but differ by a constant
fraction. This happens when the half life of the parent is only slightly higher
than that of the daughter.
Transistor
Semiconductor
device which consists of two PN junctions formed by sandwiching either P-type
or N-type semiconductor between a pair of opposite types. The prefix ‘trans’
means signal transfer property of device while ‘istor’ classifies it as solid
element in same general family with resistance.
Transistor
Biasing
The proper flow
of zero signal collector current and the maintenance of proper collector – emitter
voltage during the passage of signals is known as transistor biasing.
Transition
Temperature (Superconductivity)
The temperature
at which resistance of a substance disappears is called as transition
temperature.
Translatory
Motion
Motion of object is said to be translatory under following conditions: i) Every particle of the body experiences the same linear displacement, velocity and acceleration as any other particle of body. ii) All particles travel along parallel paths which may be straight or curved. iii) It can be produced or changed by an unbalanced force.
