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

Evaluate the path of the magnetic field, A straight vertical wire passes by...

A straight vertical wire passes by a wooden table top. The wire carries an upward directed current. Evaluate the path of the magnetic field of the wire at a point on the table top

Inertia with a spade, Inertia with a spade Scoop up a spadeful of dry e...

Inertia with a spade Scoop up a spadeful of dry earth. Now pitch the earth away from you. View that when the spade stops the earth flies on due to inertia.

What is artificial radioactivity and a-decay, Q. What is artificial radioac...

Q. What is artificial radioactivity? The phenomenon by which still light elements are made radioactive by artificial or induced methods is called artificial radioactivity. α

Describe the michelson morleys experiment, Describe the Michelson Morley's ...

Describe the Michelson Morley's experiment and explain its negative result. What is "Length Contraction" and "Time Dilation" in relativistic mechanics? Explain.

What is a capacitor, Q. What is a capacitor? Define: capacitance. i) A...

Q. What is a capacitor? Define: capacitance. i) A capacitor is a apparatus for storing electric charges. ii) The capacitance of a conductor is defined like the ratio of the

Motion in one dimension and vectors, two forces f1 500Ndue east and f2 250N...

two forces f1 500Ndue east and f2 250N due north have their common initial point f1 - f2 is

Illustrate examples of systems out of equilibrium, Illustrate Examples of s...

Illustrate Examples of systems out of equilibrium Examples of systems out of equilibrium: A) a stone thrown upwards that is at its highest point; B) a plane diving downwa

Determine the number of turns of the coil, A mild steel closed magnetic cir...

A mild steel closed magnetic circuit has a mean length of 75mm and a cross-sectional area of 320.2mm 2 . A current of 0.40 a flows in a coil wound uniformly around the circuit

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