1. April 7, 2005Created by Kristy Lynn Price SOUND TLW explore how sounds can be produced and changed. TLW identify vibrations as the source of sound. TLW compare the pitches, volumes, and intensities of sounds. TLW explain how sounds can be amplified.

2. April 7, 2005Created by Kristy Lynn Price What Causes Sound? Sound is produced when energy causes particles to vibrate When you pluck the string of a guitar, its moves back-and-forth. This motion is called a vibration. All sounds begin when something vibrates What are ways to make vibrations? Sound wave: vibrating particles in areas of crowded particles followed by widely spaced particles that travel in waves. (F55) How are sound waves like ripples in a pond? How are they different? How do you know that a water wave carries energy? Can a sound wave move through outer space, where there is no air? Why or why not?

3. April 7, 2005Created by Kristy Lynn Price How Does Sound Travel Through Different Materials? Sounds travel through solids, liquids, and gases Sound travels at different speeds in different substances Refer to the “Speed of Sound” Chart (F56) Through which material does sound travel the fastest? Earplugs block sound waves in the air from entering your ear. Why do you still hear yourself speak? Spoon and String Demonstration

4. April 7, 2005Created by Kristy Lynn Price How Do We Hear Sound? What is created when something vibrates? Refer to the Diagram of the Ear (F57) What part of the ear do sound waves travel through a gas? In what part of the ear do sound waves travel through solid material? In what part of the ear do sound waves travel through a liquid? Which parts of the ear vibrate?

5. April 7, 2005Created by Kristy Lynn Price Why Aren’t All Sounds the Same? Sound waves have three features Wavelength: the distance from one area of squeezed particles to the next Frequency: the number of times a sound source vibrates in one second Tuning Forks Vibrations/Second Frequency determines pitch Pitch is the highness or lowness of a sound Amplitude: the energy in a sound wave It is related to the loudness of sound

6. April 7, 2005Created by Kristy Lynn Price Review How is energy related to sound? What is a sound wave? What kind of materials can sound travel through? Which material does sound travel through the fastest? What are the three features of sound? Describe the relationship between frequency and pitch.