Potential well and potential barrier, Physics

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.

Posted Date: 8/1/2012 7:40:47 AM | Location : United States

Related Discussions:- Potential well and potential barrier, Assignment Help, Ask Question on Potential well and potential barrier, Get Answer, Expert's Help, Potential well and potential barrier Discussions

Write discussion on Potential well and potential barrier
Your posts are moderated
Related Questions
In a pure semiconductor, concentration of electrons in conduction band is equal to the concentration of holes in valence band. In the process of conduction when an electric field i

An athlete run a certain distance before taking a long jump. Why?

what is the principle on which deflection magnetometer work?

Convex Lens      Convex lens converges rays parallel to its principal axis. It is thick in the middle and thin at the edged.     It forms real and inverted image of an ob

Q. What percentage of a given radioactive substance will be left after 5 half -life periods? The residual part of radioactive substance = ( ½ ) 5 Therefore the percentage

Define Baron von Münchausen and Intergalactic Travel? Recently get archives of the late Baron von Münchausen brought to light some unpublished scientific papers. In one of them

to derive expreation for magnitude & direction for the resultant which two are acting at a point

A 9.0-kg crate sits on a level, rough floor. A 61-N force is required just to begin it moving. What is the size of the coefficient of maximum static friction?

Thermodynamics, Similarities between System and Control Volume (a) System and Control Volume are defined by careful in description of their boundaries. (b) System and Control Vol

i need to demonstrate the magnetic properties as a part of my assignment. then how can i do that?