An elecetron is placed inside an infite box. Quantum Mechanics

In summary, the problem involves an electron being placed inside an "infinite box" with a width of .1nm. The question asks for the minimum energy and momentum of the electron, starting from the fundamental wavelength. The solution involves finding the first harmonic or fundamental frequency of the electron in a box, which corresponds to its ground state. This can be determined using the equation L=nλ/2, where L is the width of the box and n is the harmonic number.
  • #1
Feodalherren
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Homework Statement



An e- is placed inside an "infinite box". If the box is .1nm wide, what is the minimum energy and momentum of the e-? Start from the fundamental wavelength and prove the equation you are using to calculate the energy and momentum.

Homework Equations





The Attempt at a Solution



Wait... What's the fundamental wavelength business?
 
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  • #2
The electron in a box forms standing waves. These standing waves are called harmonics. The first harmonic is called the fundamental frequency and corresponds to the electron's ground state.

I wouldn't call that box "infinite" though.
 
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  • #3
Ah cool. Then n=1 and

L=nλ/2

I got it from there. Thanks.
 

1. What is an infinite box in the context of quantum mechanics?

An infinite box is a theoretical scenario used in quantum mechanics to simplify calculations and study the behavior of particles within a confined space. It represents a container with impenetrable walls that extend infinitely in all directions.

2. What happens to an electron placed inside an infinite box?

When an electron is placed inside an infinite box, it behaves as a wave and can only exist in certain discrete energy states. It cannot escape the box due to the infinite potential barrier created by the walls of the box.

3. How does quantum mechanics explain the behavior of an electron in an infinite box?

Quantum mechanics uses mathematical equations and principles, such as the Schrödinger equation, to describe the behavior of particles at the quantum level. In the case of an electron in an infinite box, it is described as a wave function, which represents the probability of finding the electron at a specific position within the box.

4. Is the behavior of an electron in an infinite box different from that in a regular box?

Yes, the behavior of an electron in an infinite box is different from that in a regular box. In a regular box, the walls are not infinitely high, so the electron has a probability of tunneling through the walls and escaping. In an infinite box, this is not possible, and the electron is confined to specific energy states.

5. What are the practical applications of studying an electron in an infinite box?

Studying an electron in an infinite box can help us understand the fundamental principles of quantum mechanics and how particles behave in confined spaces. This knowledge can be applied in various fields, such as nanotechnology, electronics, and material science, to develop new technologies and materials with unique properties. It also has implications in fields like quantum computing and cryptography.

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