Lecture 13: Dispersive Medium, Phase Velocity, Group Velocity

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Lecture Topics

  • Dispersion
  • Dispersive medium
  • Phase velocity
  • Group velocity
  • Beat phenomenon

Lecture Video: Dispersive Medium, Phase Velocity, Group Velocity

Sending a square pulse as a basic communication tool is the main focus of this lecture. Prof. Lee discusses the phenomenon of dispersion in a realistic medium and the strategy to describe this kind of physics situation.

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> Download from Internet Archive (MP4 - 165MB)

> Download English-US transcript (PDF)

> Download English-US caption (SRT)

Lecture Notes

This resource may not render correctly in a screen reader.Typed Notes for Lecture 13 (PDF - 1.1MB)

This resource may not render correctly in a screen reader.Handwritten Notes for Lecture 13 (PDF - 1.9MB)

Textbook Reading

Chapter 8: Traveling Waves (PDF - 1.4MB) (section 8.3 to end) 

Chapter 9: The Boundary at Infinity (PDF - 1.3MB) (through section 9.2) 

Problem Set

Problem Set 7 (PDF)

Problem Solving Help Video*

Accelerated Charges Radiating Electromagnetic Waves

In-class Demonstrations

HOW IT'S DONE SEE IT IN THE LECTURE
Bell Labs Wave Machine @ 00:25:28

 

 

 

 

 

 

* Note: This Problem Solving Help video was originally produced as part of a physics course that is no longer available on OCW.

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