2. Pitch, Echolocation, and Open Pipe Resonation Presented by: Kadisha White for teens!

3. What in the world is PITCH??? Pitch is defined as the relative highness or lowness of a sound. Pitch is determined by frequency. Since pitch is mostly used in music, I’ll give you a musical example!

4. Rockin’ Musical Note Ok, so have you ever been rockin’ out on Guitar Hero and wondered how a guitar really works? Well, you probably haven't, but I’ll tell you anyway! The tighter the strings, the higher the frequency, and the higher the pitch.

5. what Echowhat? Echolocation!!!! This means pretty much just using echoes in order to find where you are. Bats survive off of echolocation. Because they can’t see, they make high pitched noises that bounce off of something and back into their ears. The bat can tell the shape, size, and texture of an object through echolocation.

6. Swimmin’ with Dolphins! Not only do bats use echolocation, but dolphins do, too. They can locate food and other objects using clicks from their mouth.

7. Resonance Every object/substance has a natural frequency at which it is "willing" to vibrate. When an external agent applies a forced vibration that matches this natural frequency, the object begins to vibrate with ever increasing amplitude, or resonate.

8. Open pipe Resonance Pipes can either be open on both ends or on only one end. The open ends act as free-end reflectors, producing antinodes, and the closed ends act as fixed-end reflectors, producing nodes. An example of this is a flute.

9. Let’s try it out!!! I NEED FOUR VOLUNTEERS!!