# 6: The Schrödinger Equation

- Page ID
- 9747

- 6.1: Schrödinger’s Equation
- In 1925 Erwin Schrödinger proposed a differential equation that, when solved, produced a complete mathematical description of the wavefunction, ψ(x), of a “particle” moving in a region of space with potential energy function U(x). Although this equation cannot be “derived” from any other physics principle, it can be shown to at least be consistent with the conservation of energy.

- 6.2: Solving the 1D Infinite Square Well
- Imagine a (non-relativistic) particle trapped in a one-dimensional well of length L. Inside the well there is no potential energy, and the particle is trapped inside the well by “walls” of infinite potential energy.

- 6.4: Expectation Values, Observables, and Uncertainty
- An electron is trapped in a one-dimensional infinite potential well of length L. Find the expectation values of the electron’s position and momentum in the ground state of this well. Show that the uncertainties in these values do not violate the uncertainty principle.

- 6.6: Solving the 1D Semi-Infinite Square Well
- Imagine a particle trapped in a one-dimensional well of length L. Inside the well there is no potential energy. However, the “right-hand wall” of the well (and the region beyond this wall) has a finite potential energy. This means that it is possible for the particle to escape the well if it had enough energy.

- 6.A: Solving the Finite Well (Project)
- Imagine a particle trapped in a one-dimensional well of length 2L. Inside the well there is no potential energy while the region outside the well has a finite potential energy. This potential energy function is referred to as the finite square well.

- 6.A: Solving the Hydrogen Atom (Project)
- Enough with pretending atoms are three-dimensional, infinite square wells! It’s time to tackle an atom for real. (Before we get too excited, the atom under analysis is hydrogen. All other atoms are impossible to solve analytically.)