The nearly-free electron model, Physics

Assignment Help:

Consider an electron in a simple one-dimensional periodic potential. The energy of the electron will vary periodically due to the influence of the periodic potential, and can be described by an energy-wavevector relation:
E(k)=-Acos(ka)
where a is the lattice constant and k is the Bloch wavevector.
a) Obtain an expression for the velocity of a wavepacket as a function of k

Related Discussions:- The nearly-free electron model

Special Relativity (massless), 1]What is the difference between a photon an...

1]What is the difference between a photon and a neutron? 2]Why are they massless?

What is meant by the term modulation, What is meant by the term 'modulation...

What is meant by the term 'modulation'? Define with the help of a block diagram, how the process of modulation is carried out in radio broadcasts.

What is the charge of each of the particles, Q. What is the charge of each ...

Q. What is the charge of each of the particles? The e is a unit of charge and it isn't an SI unit of charge but it is a valid unit of charge. In expressions of this unit of cha

What affect does electricity have on soil, What affect does electricity hav...

What affect does electricity have on soil? Electrical current and ions can cause definite molecules (and moisture) to adhere to soil. Large amounts of current, like a lightning

How can be made p-type semiconductor, a) What is the magnitude of a point e...

a) What is the magnitude of a point electric charge chosen so that the electric field because of it at a point 50 cm away has magnitude 2.0 NC¯¹ ? (b) Get a mathematical expre

Thomson''s effect, a) Thomson's heat is proportional to the current passing...

a) Thomson's heat is proportional to the current passing by the conductor. b) This effect is produced when parts of similar conductor are kept at dissimilar temperature. c) I

Compound microscope with construction and working, explain compound micro...

explain compound microscope

Voltages relative to earth, Voltages relative to earth It is very commo...

Voltages relative to earth It is very common in electrical circuits to have an earth connection. This earth connection has no effect on potential differences across components

find the maximum speed of rod, A constant force of 10N is applied perpendi...

A constant force of 10N is applied perpendicular to rod placed on 2 parallel rails .If the rod is having a resistance 10ohm but rails have zero resistance then maximum speed of rod

Capacitor construction, Capacitor have thin conducting plates (usually made...

Capacitor have thin conducting plates (usually made of metal) separated by a layer of dielectric, then stacked or rolled to form a compact device. Many types of capacitors are avai

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages