# How many points of zero probability in a finite well?

• L_landau
In summary, in a finite potential well deep enough to allow for an electron state with n=4, there are (a) n-1 points of zero probability and (b) n points of maximum probability for its matter wave. The analogy between clamped strings and quantization fails in this case, as the wavefunction probability is non-zero in the potential. The number of nodes is n+1 and the number of antinodes is n.
L_landau

## Homework Statement

An electron is trapped in a finite potential well that is deep enough to allow the electron to exist in a state with n=4. How many points of (a) zero probability and (b) maximum probability does its matter wave have within the well?

## Homework Equations

For infinite potential well there are nodes at the walls and λ = 2L/n as in the case of a string with two clamps.
In this case there are n+1 nodes and n antinodes.

## The Attempt at a Solution

I read in the textbook that the analogy between clamped strings and quantization fails for the finite potential well because the wavefunction probability is non-zero in the potential. Judging by the graphic included, I would say that there are (a) n-1 nodes and (b) n antinodes for the finite potential well case. Is this right?

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L_landau said:
Judging by the graphic included, I would say that there are (a) n-1 nodes and (b) n antinodes for the finite potential well case. Is this right?
Yes, that's right.

## 1. How do you define a finite well?

A finite well is a quantum mechanical potential energy barrier that has a finite width and depth. It is often used to model the confinement of particles in a specific region.

## 2. What are the points of zero probability in a finite well?

The points of zero probability in a finite well are the locations where the wave function of a particle is equal to zero. These points are typically found at the boundaries and at the center of the well.

## 3. How many points of zero probability are there in a finite well?

The number of points of zero probability in a finite well depends on the specific dimensions and shape of the well. In general, there can be multiple points of zero probability, but the exact number can vary.

## 4. What is the significance of the points of zero probability in a finite well?

The points of zero probability in a finite well represent the locations where the particle has no chance of being found. This is due to the wave function being equal to zero at these points, indicating that the particle cannot exist there.

## 5. How do the points of zero probability affect the behavior of particles in a finite well?

The points of zero probability play a crucial role in determining the energy levels and allowed states of particles in a finite well. They also influence the probability of tunneling through the well barrier. Understanding the points of zero probability is essential in studying the behavior of particles in a finite well.

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