# Quantum Mechanics Videos

Here you will find 4 free Quantum mechanics video lectures.

Video
Level 2 (without higher mathematics)

## Photoelectric Effect and The Einstein Formula Simply Explained

Here you will learn what the photoelectric effect is, how it can be described with a Einstein formula + everything you need to know about it.

Content of the video
1. 00:00 What is the photoelectric effect?
2. 00:07 Experiment setup
3. 00:46 Photons
4. 01:58 Work function and threshold frequency
5. 03:48 Convert electron volts to joules and vice versa
6. 04:19 Kinetic energy of an electron
7. 04:50 Einstein formula
8. 05:36 Stopping (braking) voltage
9. 07:20 Energy frequency graph
Video
Level 3 (with higher mathematics)

## Hermitian Operators Simply Explained

In this physics video you will learn what Hermitian operators and matrices are and what important properties they have.

Content of the video
1. 00:00 Motivation: Real mean values
2. 01:16 What are Hermitian operators?
3. 02:16 What is a self-adjoint operator?
4. 02:56 Notation of a Hermitian operator
5. 03:20 Eigenvalues are real
6. 04:27 Eigenvectors are orthogonal
7. 05:56 Eigenvectors form a basis
8. 06:37 What is a Hermite matrix?
9. 07:19 Examples for (non) Hermitian matrices
Video
Level 2 (without higher mathematics)

## De-Broglie Wavelength And The Wave-Like Matter

Here you will learn about de Broglie wavelength (matter wavelength), its derivation, an example and how de Broglie wavelength can be expressed with voltage.

Content of the video
1. [00:00] Wave-particle duality
2. [00:46] Derivation of the De Broglie wavelength
3. [02:40] Example
4. [03:35] De Broglie wavelength using voltage
Video
Level 3 (with higher mathematics)

## Schrodinger Equation explained extensively in 50 minutes!

In this quantum mechanics lecture you will learn the Schrödinger equation (1d and 3d, time-independent and time-dependent) within 45 minutes.

Content of the video
1. [00:10] What is a partial second-order DEQ?
2. [01:08] Classical Mechanics vs. Quantum Mechanics
3. [04:38] Applications
4. [05:24] Derivation of the time-independent Schrödinger equation (1d)
5. [17:24] Squared magnitude, probability and normalization
6. [25:37] Wave function in classically allowed and forbidden regions
7. [35:44] Time-independent Schrödinger equation (3d) and Hamilton operator
8. [38:29] Time-dependent Schrödinger equation (1d and 3d)
9. [41:29] Separation of variables and stationary states