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

Why ferrite core has less eddy current loss than iron core, A ferrite core ...

A ferrite core has less eddy current loss than an iron core because ferrites have (A) High resistance. (C) Low permeability. (B) Low resistance. (D) High hyster

Harmonic oscillator , Determine the zero-point energy of a harmonic oscilla...

Determine the zero-point energy of a harmonic oscillator havingof a particle of mass 2.33 x 10 -26 kg and force constant 155 N m -1 .

Explain about cut-off or stopping potential, Q. What is cut-off or stopping...

Q. What is cut-off or stopping potential? The minimum negative (retarding) potential specified to the anode for which the photo electric current becomes zero is called the cut

What is asteroids, What is an asteroid, comet, dwarf planet with respect to...

What is an asteroid, comet, dwarf planet with respect to their mass, moment of inertia and dimension? Ans) Dwarf Planet is lighter,smaller than a planet ( Pluto ).They usually a

What are emissive and absorption spectra, Q. What are emissive and absorpti...

Q. What are emissive and absorption spectra? Emission spectrum: When the light emitted straight from a source is examined with a spectrometer the emission spectrum is ob

Lambert''s laws, Lambert's laws (J.H. Lambert): Lambert's first law ...

Lambert's laws (J.H. Lambert): Lambert's first law The illuminance on a surface illuminated through light falling onto it perpendicularly from a point source is propor

Can you explain about sharpness of resonance, Can you explain about sharpne...

Can you explain about sharpness of resonance?

Experiment of simple steelyard, Simple steelyard (reading to 100 g) The...

Simple steelyard (reading to 100 g) The pan is made from cardboard, and is formed like a funnel. It is fixed to a beam made of a triangular-shaped lamina in ply- wood or 'Persp

Explain the ray diagrams for mirrors, Explain the Ray Diagrams for Mirrors?...

Explain the Ray Diagrams for Mirrors? To figure out the position and size of an image reflected by a curved mirror, you can draw a scaled diagram of the mirror as follows: along

Electrical Induction, Can you explain Electrical Induction?

Can you explain Electrical Induction?

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages