Chapter 3 Lesson 2: What is Sound Energy

Vocab. Match-Up Match the vocabulary words with their definition. vibration the back and forth motion of an object pitch how high or low a sound is frequency the number of compressions that pass by a point each second 1. The whistle of a tea kettle has a higher pitch than a drumbeat. true false 2. Your vocal cords act like a guitar string. true false 3. Where can sound travel? in a vacuum only in the air and under water through solids, liquids, and gases in air only 4. A siren's sound suddenly becomes very loud. What could be the cause of it? The siren is vibrating less. The siren is moving away from you. The siren is moving closer to you. The siren is turned up louder as it gets closer. 5. Why can sound not travel through a vacuum? because it is being pulled in too fast because there are no particles because it is dark because it is in space 6. Sound travels faster through air than it does through water. true false 7. Why is the pitch of a thick guitar string lower than the pitch of a thin string? the thick guitar string vibrates slower the thick guitar string vibrates faster the thick guitar string's vibrations have more energy 8. What happens when a sound wave reaches a certain object and bounces back? The pitch gets higher The volume gets louder the sound stops You hear an echo 9. Sound waves that are louder have more energy. true false