1. Unit: Sound and Light
Lesson 1 “The Nature of Sound”
Essential Questions:
1.) What is sound?
2.) What factors affect the speed of sound?

2. What is sound?
Sound is a disturbance that travels through a medium as a longitudinal wave

3. A sound wave begins with a vibration
Sound often travels through air, but it can also move through solids and liquids too
Sound waves can bend around objects

4. What factors affect the speed of sound?
Temperature
Sound travels slower at colder temperatures

5. Stiffness
Sound travels faster in solids than in liquids and gases

6. Density
Sound travels slower in denser materials