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

Why x-ray photon collides with a free electron, An x-ray photon collides wi...

An x-ray photon collides with a free electron, and the photon is scattered.  During this collision there is conservation of: a) momentum but not energy b) neither moment

Atomic bonding, There is more number of substances in the universe than 109...

There is more number of substances in the universe than 109 elements. Most matter we run into on a day-to-day basis is composed of compounds-substances in which two or more element

Oscillations, M is the magnetic moment of bar magnet and T is time period ...

M is the magnetic moment of bar magnet and T is time period of oscillation. If we make M as M/4 then what will be the time period

Write the equation of an equipotential line, The equation of an equipotenti...

The equation of an equipotential line in an electric field is y=2x then the electric field strength vector at (1,2) may be?

Engineering materials and engineering materials properties, Engineers and t...

Engineers and technologist engage themselves in the design and manufacturing of machine like latches, engines, motors, generators, bulldozers etc. And in the fabrication of vehicle

Heat loss in a cylindrical pipe, The project consists of a word processed (...

The project consists of a word processed (typed) report submitted by the project report due date. Late submissions are penalized 10% of the mark per day, including Saturdays and Su

Explain radioactivity and its problems and applications, Explain Radioactiv...

Explain Radioactivity and its Problems and Applications ? All radiation, electromagnetic as well as the kind from nuclear decay, takes its toll on living organisms. If the radiati

Determine the pressure against the inside walls of the pipe, When a liquid ...

When a liquid moves by a pipe having a varying diameter, the pressure against the inside walls of the pipe will be: a)  The same throughout b)  Lowest where the diameter is

Discuss the constituents of developer, Question 1. Discuss the constitu...

Question 1. Discuss the constituents of developer 2. List the different types of X-ray cassettes .Explain the construction of the X-ray cassette 3. What is contrast? Expl

Explain about the term step index fibre, Explain about the term step index ...

Explain about the term step index fibre. Step index fibre: Into a step index fibre, the refractive index keeps constant throughout the core and decreases at the core-claddin

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