PHY138: Physics for the Life Sciences

Department of Physics, University of Toronto

Jason Harlow
Wednesday, November 14, 2007

Waves Section, Lecture 4: Sound, Light, Power and Intensity, Doppler Effect

Chapter 20: Traveling Waves.


  • Section 20.5: Sound and Light
  • Section 20.6: Power and Intensity
  • Section 20.7: Doppler Effect


Extra notes:

“How Ultrasound Works” by Craig C. Freudenrich:  Web format,  PDF Format


Side-screen Slides

Web Format

Powerpoint Format (.ppt)

PDF Format


Central Screen tablet notes

Web Format

PDF Format



Tuning fork animation:




Doppler Effect Applet


Flash Animation of Doppler Effect


Electromagnetic Wave Applet


Electromagnetic Wave Movie from MIT