Sound – Online Tutorial http://www.ndt-ed.org/EducationResources/HighSchool/Sound/hs_sound_index.htm Instructions: Read sections 1-7 and answer the following questions. Introduction Vibration The Speed of Sound in Air The Speed of Sound in Other Materials Temperature and Speed of Sound The Human Ear The Components of Sound Questions: 1. What is sound and how does it travel? 2. What do sound waves consist of? 3. What do sound waves look like? 4. What is the speed of sound through air at sea level? 5. What is the sound barrier? 6. Why do we see lightning before thunder? 7. What happens to the speed of sound when you change the material through which the sound travels? 8. Through which material does sound move faster? Why do you think it is faster? 9. What happens to the speed of sound when the temperature changes? 10. Does sound travel faster or slower as temperature increases? 11. What are the three main sections of the ear? 12. Why are sounds different? 13. What is the relationship between amplitude and intensity? 14. What is intensity measured in? 15. What is the relationship between frequency and pitch?