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

Explain working principle of d.c motor, Working Principle of D.C Motor ...

Working Principle of D.C Motor A) An electric motor is a machine which changes electrical energy into mechanical energy. B) When a current carrying conductor is placed in a

Hawking radiation, Hawking radiation (S.W. Hawking; 1973): Black holes...

Hawking radiation (S.W. Hawking; 1973): Black holes emit radiation such as any other hot body. Virtual particle-antiparticle pairs are being formed in supposedly empty space c

Occilation, if we drill a hile along the diametre of earth and drop a ball ...

if we drill a hile along the diametre of earth and drop a ball inside it then what will happen the ball will occilate or drop down in the space

Suidqs (super conducting quantum interference devices), SQUIDs, or super co...

SQUIDs, or super conducting Quantum interference devices are used to measure minute changes in magnetic flux by means of a pair of Josephson junctions, often used to detect extrem

Find the power rating of the heater, Electrical equipment in an office take...

Electrical equipment in an office takes a current of 13A from a 240V supply. Estimate the cost per week of electricity if the equipment is used for 30 hours every week and 1kW

Olbers paradox, Olbers' paradox (H. Olbers; 1826): If the Universe is ...

Olbers' paradox (H. Olbers; 1826): If the Universe is uniform, infinite & unchanging then the whole sky at night would be bright regarding as bright as the Sun. The further yo

Coherence, Explain the concept of coherence.Discuss temporal coherence and ...

Explain the concept of coherence.Discuss temporal coherence and spatial coherence.

Discharging of solar cell, Discharging: The cell is connected across some ...

Discharging: The cell is connected across some load during discharging. As the direction of current by the cell is reversed during discharging the negative ions go in the directio

Transition metal catalyst , Hydrogenation reactions are facilitated by the ...

Hydrogenation reactions are facilitated by the use of a transition metal catalyst such as Ni or Pt. Predict the signs of ΔH, ΔS and ΔG when hydrogen gas is adsorbed onto the surfac

Diffrence between isobaric process and isochoric process, Diffrence between...

Diffrence between isobaric process and isochoric process   A process in which the pressure is kept constant is known as isobaric process. (i.e.  ΔP=0) A process in which

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd