Potential well and potential barrier, Physics

Assignment Help:

Q. Explain what do you understand by the terms potential well and potential barrier. How does a particle with energy lesser than the barrier height tunnels through its quantum mechanically? Give one example.

Sol. Consider a particle of energy E is incident from the left on a rectangular potential barrier of height and width and on both sides of this barrier at which means that no force act upon the particle in this regions. Therefore, the potential function is defined as if a particle having energy E less than then classically the particle will always be reflected completely and hence will not penetrate the barrier. But according to wave mechanics the particles has some probability of penetrating this barrier and appear in region III.

This is called quantum mechanical tunneling or tunnel effect. According to this, if a particle is moving towards the barrier with energy E less than the height of potential barrier, then it is not necessary to reflect completely by the barrier but there is always a probability of particle to cross the barrier and continue its forward motion.


Related Discussions:- Potential well and potential barrier

High acuity nursing care, High Acuity Nursing Care: Issues Paper Pu...

High Acuity Nursing Care: Issues Paper Purpose:             The student nurse will use knowledge gained through class work, clinical, and independent library investigati

Parallel forces, Examples of like and unlike parallel forces?

Examples of like and unlike parallel forces?

Omega, ohm; Omega; O (after G. Ohm, 1787-1854): The derived SI unit of...

ohm; Omega; O (after G. Ohm, 1787-1854): The derived SI unit of electric resistance, described as the resistance among two points on a conductor while a constant potential dif

Minimum in sound intensity, Two speakers are driven by the same oscillator...

Two speakers are driven by the same oscillator whose frequency is f. They are located a distance d from each other on a vertical pole. A man walks straight toward the lower speaker

Object located between the focal point and the mirror, Object Located Betwe...

Object Located Between the Focal Point and the Mirror Ray diagrams are meaningful tools for denoting the location of an image as generates through a concave mirror. To denote t

Plane and convex mirrors, (a) You have studied that plane and convex mirror...

(a) You have studied that plane and convex mirrors produce virtual images of objects. Can they generate real image under some circumstances? Explain. (b) A virtual image we a

Theory, Quantum theory of gravity

Quantum theory of gravity

What is the centre point of gravity?, An imaginary point in a body of matte...

An imaginary point in a body of matter where, for convenience in certain calculations, the total weight of the body may be thought to be at that point.It is a point where the gravi

F=ma and f - ma = 0 are they similar or not?, Ans) In the first one..... F=...

Ans) In the first one..... F=ma...the only force which acts is F...which causes an acc. of ''a'' to the body of mass m... and as the force=>F=ma but on the second... let .

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