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

State kirchhoff rules of current distribution, State Kirchhoff's rules of c...

State Kirchhoff's rules of current distribution in an electrical network. Using these rules verify the value of the current in the electric circuit given below.

Electric, Find the electric field between the plates of a capacitor given t...

Find the electric field between the plates of a capacitor given the following:? (1) C= 10pF (2) the capacitor is connected to a 25 V battery (3) there is a vacuum between the capa

Explain ultra violet waves, Ultra violet Waves: The wavelength of ultra...

Ultra violet Waves: The wavelength of ultra violet wave from 380mm down to 60nm.

Illustrate the electric field lines of a point charge q, The electric field...

The electric field E because of a point charge at any point near it is explained as where q is the test charge and F is the force acting on it. What is the physical significance of

Calculate the total energy of a simple harmonic oscillator, Can you show ma...

Can you show mathematically that the total energy of a simple harmonic oscillator remains constant?

Kinetic energy of the block at the bottom of the plane, A block of wood ini...

A block of wood initially at rest slides down an inclined plane. Neglecting friction, the kinetic energy of the block at the bottom of the plane is: a) All converted into h

Distinguish between electric power and electric energy, Q. Distinguish betw...

Q. Distinguish between electric power and electric energy. Electric power i) Electric power is described as the rate of doing electric work. ii) Electric power is the cre

Project work, write a note on pascal discovry in helping to make hydrolic j...

write a note on pascal discovry in helping to make hydrolic jacks

What is acceptor circuit, Q. What is acceptor circuit ? Give the uses of it...

Q. What is acceptor circuit ? Give the uses of it. Acceptor circuit The series resonant circuit is frequently called an acceptor circuit. By proffering minimum impedan

Faradays law, FARADAYS LAW: When the magnetic flux through the coil is ...

FARADAYS LAW: When the magnetic flux through the coil is made to vary, an emf is induced in the coil. The magnitude of the induced emf is proportional to the rate of change of

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages