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Electrons have very much smaller mass than that of ions, so they respond more rapidly to a changing electric field. For electric field that oscillates at extremely high frequencies (like light) only electronic polarization can takes place. At lesser frequencies, the relative displacement of positive and negative ions can takes place. Orientation of permanent dipoles, which require the rotation of a molecule can occur only if the oscillation is relatively show (MHz range or slower). The total polarization P, total polarizability and the relative permittivity of a dielectric in an alternating field all depend on the ease with which the dipoles can reverse alignment with each other reversal of the field. Some polarizability mechanisms do not permit sufficiently rapid reversal of the dipole alignment. In such a process the time required to reach the equilibrium orientation is called the relaxation time and its reciprocal the relaxation frequency. It can be also defined as the time specific polarization to occur is called the relaxation time. When the frequency of the applied field exceeds that of the relaxation frequency of a particular polarization process, the dipoles cannot reorient fast enough and operation of the process ceases.
Plot the Bremsstrahlung emitted (intensity vs energy) from a copper target for (i) both 15 keV and 30 keV electrons, (ii) for 15 keV electrons at both 10 and 50 mA current and (iii
Bug on a Bowling Ball A bug sitting on top of a bowling ball begins to slide o? with negligible friction. Conclude the angle at which the bug leaves the surface. This proble
The dimentional formula of plank;s constant ML 2 T -1
How is a wave front dissimilar from a ray ? Draw the geometrical, shape of the wave fronts when (i) light diverges from a point source, and (ii) light emerges out of a convex le
Used normally, a 150-watt, 120 volt light bulb requires how many amps of current? Ans: Used generally, a 150-watt, 120 volt light bulb needs 1.25 amps.
Assigned homework a. The objective of this problem is to get a sense of the tradeoff between cross-section and stiffness for beam structural member. Consider a beam that is 1 me
Y the charge n voltage. Remain constant ven we connect capacitors in series. N parallel. Respectively??
Using a pulley Use the pulley set-up shown in experiment A 12. Apply the force on the movable pulley and get how rapidly the weight on the other end of the string rises.
a body is thrown horizontally with a velocity of u from the top of a tower. the displacement of the stone when the horizontal and vertical velocities are equal is
what is expansion of solids
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