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
Derive the mathematical expression PV r = constant for an ideal gas undergoing adiabatic reversible expansion.

Two slits in young''s double slit experiment are illuminated by two different sodium lamps emitting light of same wavelength . Do you observe any interference pattern on the screen

Get a mathematical expression for the torque on a loop placed in a uniform magnetic filed. Define the working and construction of moving coil galvanometer?

Five coulombs of charge are placed on a thin-walled conducting shell. Once the charge has come to rest, the electric potential inside the hollow conducting shell is found to be:

notes on ac equivalence circuit with active devices

Work is equal to which of the following? a) The cross product of force and displacement. b) The product of force times time c) Force divided by time d) The dot

A modern turbofan engine in a commercial jet takes in air, part of which passes through the compressors, combustion chambers, and turbine, and the rest of which bypasses the compre


We can produce energy from dynamic Casimir effect?

how to frame constraint equations easily in physics for the chapter newtons laws of motion