Weak & Strong Isospin

After watching this video, you’ll be able to answer these questions:
– What is the main use of isospin?
– Why is it called spin?
– Who introduced the concept?
– What are the two kinds of isospins nowadays?
– What does the weak isospin decide?

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How to Measure Gravitational Waves

After watching this video, you’ll be able to answer these questions:
– How does LIGO work?
– Does a gravitational wave also stretch light?
– If yes, is this a problem for our measurement?

Photoemission Spectroscopy

After watching this video, you’ll be able to answer these questions:
– How does a PES work?
– What is the Fermi level?
– What’s a work function?
– How can you measure the local density of states of electrons?

Causality & Light Cones

After watching this video, you’ll be able to answer these questions:
– How does a timelike/spacelike/lightlike vector look in a Minkowski diagram?
– What do we mean by timelike / space like separation?
– How do you draw the light cone in a Minkowski diagram?
– How can you use the light cone to decide on causality?

Snell’s Law

After watching this video, you’ll be able to answer these questions:
– What is the refraction index?
– Which component of the momentum doesn’t change when passing through a surface?
– How is a beam of light affected when entering water from air?
– State Snell’s law!

Density of States | Free Electrons

After watching this video, you’ll be able to answer these questions:
– Where can the model of free electrons be applied?
– How is the number of states in a material determined?
– What does the density of states in 1d/2d/3d look like?
– What is a Van Hove singularity?

Dimensional Analysis

After watching this video, you’ll be able to answer these questions:
– How do you go from natural units to SI units?
– What are the four steps in dimensional analysis?
– How are mass, length and time related in natural units?

Free Electron Dispersion Relation

After watching this video, you’ll be able to answer these questions:
– How can you calculate the relativistic energy-momentum relation?
– Why do we need a low-energy approximation?
– What are the term appearing in this low-energy approximation?
– What is the relation between the dynamic mass and the rest mass?
– What is the dispersion relation of a free electron gas?

Units & s²-Hyperbolas

After watching this video, you’ll be able to answer the following questions:
– How is the Minkowski metric related to Minkowski diagrams?
– What’s the angle between the old and new coordinates?
– Why do all points on a hyperbola s^2=const describe the same time/length?

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