Both light and sound travel as waves.  Sound waves must be transmitted through some kind of medium whether it is a solid, liquid, or gas.  Light does not need a medium to propagate.  Thus, in the vacuum of outer space, you can see but not hear.  In this unit, you will learn many interesting facts about waves, sound ,and light. (Prentice Hall Conceptual Physics-Paul Hewitt)

Lectures and Notes:

Syllabus (Conceptual Physics)
Chapter 26 Student Notes (Sound Waves)
Chapter 27 Student Notes (Light Waves)
Chapter 26 PowerPoint Lecture (Sound Waves)
Chapter 27 PowerPoint Lecture (Light Waves)

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