Pitch, Echolocation, and Open Pipe Resonation

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Pitch, Echolocation, and Open Pipe Resonation
for teens!

• Presented by Kadisha White

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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,
  Ill give you a musical example!

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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 Ill tell you
  anyway! The tighter the strings, the higher the
  frequency, and the higher the pitch.

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Echowhat?

• Echolocation!!!! This means pretty much just
  using echoes in order to find where you are. Bats
  survive off of echolocation. Because they cant
  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.

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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.

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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.

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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.

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• Lets try it out!!!
• I NEED FOUR VOLUNTEERS!!