Differbetween
- What is average relaxation time?
- What is molecular relaxation?
- What is the order of relaxation time?
- What is the symbol of relaxation time?
- What is relaxation time in SHM?
- How does temperature relate to relaxation?
- What do you mean by relaxation process?
- What is T1 and T2 relaxation in MRI?
- What is the definition of relaxation?
- What is relaxation frequency?
- What is thermal relaxation?
- What is relaxation time in rheology?
What is average relaxation time?
Relaxation time is defined as the time interval between two successive collisions of electrons in a conductor when current flows through it. It is denoted by τ. Consider a conductor having length l, area of cross section A and current density n. Therefore, the expression for electrical resistivity is given by ρ=mne2τ.
What is molecular relaxation?
Relaxation phenomenon, in physics and chemistry, an effect related to the delay between the application of an external stress to a system—that is, to an aggregation of matter—and its response. It may occur in nuclear, atomic, and molecular systems.
What is the order of relaxation time?
Solution : The order of relaxation time is 10-14 s. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.
What is the symbol of relaxation time?
(i) Relaxation time (τ): In the absence of an external electric field, the free electrons in a metallic substance will move in random directions, so that the resultant velocity of free electrons in any direction is equal to zero.
What is relaxation time in SHM?
1 : the time required for an exponentially decreasing variable (as the amplitude of a damped oscillation) to drop from an initial value to 1/e or 0.368 of that value (where e is the base of natural logarithms)
How does temperature relate to relaxation?
When the temperature of the conductor increases, the resistivity of the conductor increases and hence according to the formula the relaxation period decreases.
What do you mean by relaxation process?
Relaxation processes allow nuclear spins to return to equilibrium following a disturbance, e.g. a radiofrequency pulse. ... The first is closely related to spin–lattice relaxation, and arises from the finite lifetime of the spin states, through the uncertainty principle.
What is T1 and T2 relaxation in MRI?
T1 (longitudinal relaxation time) is the time constant which determines the rate at which excited protons return to equilibrium. ... T2 (transverse relaxation time) is the time constant which determines the rate at which excited protons reach equilibrium or go out of phase with each other.
What is the definition of relaxation?
1 : the act of relaxing or state of being relaxed. 2 : a relaxing or recreative state, activity, or pastime : diversion. 3 : the lengthening that characterizes inactive muscle fibers or muscles.
What is relaxation frequency?
The frequency at which the dielectric loss factor (∊”) reaches a maximum, for a dielectric material that has no static (d.c.) conductivity and that is subjected to an alternating electromagnetic field. From: relaxation frequency in A Dictionary of Earth Sciences »
What is thermal relaxation?
Thermal relaxation time (TRT) describes how quickly an object loses heat energy. Typically, it is the time taken for the temperature of an object to drop to either 50% or 36.78% (the 1/e value) of its maximum value, depending on which definition you use.
What is relaxation time in rheology?
In other words, Non-Newtonian fluids have a characteristic memory time scale which is referred to as the relaxation time. When the applied rate of deformation is reduced to zero, these materials relax over their characteristic relaxation time - a constitutive property of each material.
