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Understanding Modern Physics

Understanding Modern Physics is a three-course series that takes you through the major conceptual revolutions of 20th-century physics: relativity, quantum mechanics, and the physics of complexity. You'll build a rigorous understanding of how physicists model space, time, matter, and information. The first course covers special and general relativity and cosmology, showing how space and time unify into spacetime and how gravity emerges from its curvature. The second course introduces quantum mechanics, atomic physics, and quantum information, covering the Schrödinger equation, atomic structure, and the basics of quantum computing. The third course extends this foundation to the action principle, particle physics, entropy and information theory, and the mathematics of complex and chaotic systems. Throughout the series, you'll work through derivations and calculations rather than descriptive overviews alone, using tools such as Lorentz transformations, the Schrödinger equation, matrix representations of spin, and entropy and fractal-dimension calculations. Who this is for: Physics students and science enthusiasts who want to build a rigorous, technical understanding of modern physics. Course I states this audience directly, and the technical depth of Courses II and III — deriving the Schrödinger equation, using matrix representations of quantum spin, and calculating entropy and fractal dimensions — points to the same level of learner throughout the series.

Status: Mathematical Modeling
Status: Physics
BeginnerSpecialization

Top reviews across Understanding Modern Physics

Reviewed Feb 19, 2023
Course: Understanding Modern Physics I: Relativity and Cosmology

Very interactive. The quizzes and assignments make you reflect and think deepera bout the material.

Reviewed Oct 28, 2022
Course: Understanding Modern Physics II: Quantum Mechanics and Atoms

A​ good introduction to quantum mechanics that does not require excessive mathematical skills.

Reviewed May 19, 2022
Course: Understanding Modern Physics I: Relativity and Cosmology

Instructor did an excellent job of introducing new topics by asking rhetorical questions that highlight what is to be covered next.

Reviewed Jan 22, 2024
Course: Understanding Modern Physics II: Quantum Mechanics and Atoms

I extend my thanks to speaker for the elaboration of the content in a systematic order.

Reviewed Jan 13, 2022
Course: Understanding Modern Physics I: Relativity and Cosmology

Y​i Wang does an excellent job of capturing the most important elements of the subject and demonstrating how they can be best understood. Well done!

Reviewed Apr 18, 2024
Course: Understanding Modern Physics II: Quantum Mechanics and Atoms

Quite an interesting class with an extremely passionate Professor (Instructor) of the course: Understanding Modern Physics II: Quantum Mechanics and Atoms

Reviewed Sep 22, 2022
Course: Understanding Modern Physics I: Relativity and Cosmology

I​t's an excellent introduction to the topics mentioned. The Special Relativity part is explained pretty well.

Reviewed Oct 11, 2022
Course: Understanding Modern Physics II: Quantum Mechanics and Atoms

A​mazing resource. I recommend starting with this course + Susskind's theoretical minimum. You can go anywhere from here:D

Reviewed May 29, 2025
Course: Understanding Modern Physics I: Relativity and Cosmology

course is great and quality of material is also good, yi wang - great professor, but i found it a bit difficult to get through his examples but that was my individual experience else, its good...

Reviewed Aug 6, 2025
Course: Understanding Modern Physics II: Quantum Mechanics and Atoms

Quite beginner-friendly, notes/resources are quite helpful, especially with the complicated maths. As a high school student I would recommend it for anyone interested in the field.

Reviewed Jun 13, 2022
Course: Understanding Modern Physics I: Relativity and Cosmology

This was a most interesting course. It clarified many points for me which I had picked up from previous readings..The quality of the lectures was excellent.

Reviewed Sep 1, 2023
Course: Understanding Modern Physics II: Quantum Mechanics and Atoms

A gentle, but fascinating introduction to quantum mechanics. The lecturer did a phenomenal job and the assignments felt challenging but fair. Really good!

Learner reviews across Understanding Modern Physics

Showing: 19 of 52

Brian
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Feb 3, 2022Course: Understanding Modern Physics I: Relativity and Cosmology
Jan
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Aug 1, 2024Course: Understanding Modern Physics I: Relativity and Cosmology
dikshant
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Apr 17, 2022Course: Understanding Modern Physics I: Relativity and Cosmology
Rubén
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jul 27, 2022Course: Understanding Modern Physics I: Relativity and Cosmology
Arzhel
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jul 2, 2023Course: Understanding Modern Physics I: Relativity and Cosmology
Nguyen
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Dec 18, 2021Course: Understanding Modern Physics I: Relativity and Cosmology
Stephen
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jan 14, 2022Course: Understanding Modern Physics I: Relativity and Cosmology
Omeni
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Feb 19, 2023Course: Understanding Modern Physics I: Relativity and Cosmology
Patrick
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Sep 15, 2022Course: Understanding Modern Physics I: Relativity and Cosmology
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Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jul 30, 2023Course: Understanding Modern Physics I: Relativity and Cosmology
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Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jul 7, 2024Course: Understanding Modern Physics I: Relativity and Cosmology
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Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jun 29, 2023Course: Understanding Modern Physics I: Relativity and Cosmology
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Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jul 12, 2023Course: Understanding Modern Physics I: Relativity and Cosmology
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Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jun 14, 2022Course: Understanding Modern Physics I: Relativity and Cosmology
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Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jan 29, 2026Course: Understanding Modern Physics I: Relativity and Cosmology
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Course: Understanding Modern Physics I: Relativity and CosmologyReviewed May 20, 2022Course: Understanding Modern Physics I: Relativity and Cosmology
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Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jul 3, 2022Course: Understanding Modern Physics I: Relativity and Cosmology
Abhay
Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Jan 24, 2025Course: Understanding Modern Physics I: Relativity and Cosmology
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Course: Understanding Modern Physics I: Relativity and CosmologyReviewed Sep 1, 2026Course: Understanding Modern Physics I: Relativity and Cosmology