What are Waves

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• What are Waves?
• A Disturbance where
• Energy is transferred
• Matter is not

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Characteristics of a Wave
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Two Classifications of Waves

• Mechanical moves through medium
• Electromagnetic does not need medium to exist

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Mechanical Waves

• Use Matter to transfer Energy
• The matter through which a wave travels is called
  the Medium
• Examples
• Air Sound
• Water ripples in a pond
• Solids earth quakes

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Looks Like!!
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Sounds Like!!

• An F/A-18 jet breaks the sound barrier

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Two Types of Mechanical Waves

• Transverse
• Longitudinal

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Wave Behavior

• How do waves
• do what they do?

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Reflection

• Reflection of a wave occurs when the wave strikes
  an object or surface and bounces off.

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Sound Waves

• When a sound wave reflects, it is known as an
  echo the sound reflects from the surrounding
  surfaces, as in this photo of a canyon.

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Sound Wave Reflecting Off a Wall
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• A Ships Sonar
• Reflects Sound off
• of the Ocean Floor

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Light Waves

• A reflection in a mirror or a pond is a
  reflection of light bouncing back to your eyes.
  If the surface is smooth and even, the reflection
  will be clear.

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• If the surface is uneven, like ripples in a pond,
  the light is reflected in many directions and the
  image is not clear.

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Refraction
Refraction

• Refraction is the bending of a wave as it moves
  from one medium into another.

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• Refraction is what gives the illusion of a bent
  straw or spoon in a clear glass of water. Light
  waves travel faster in air than in water, so as
  it passes through the water, it slows down and
  appears to bend.

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• As light passes through a prism, such as a
  crystal or a drop of water, refraction causes
  light to bend and separate into many colors and
  produces a rainbow.

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ROYGBIV
ROYGBIV

• The colors go in order of ROYGBIV Red, Orange,
  Yellow, Green, Blue, Indigo, and Violet. This is
  the order of the colors seen in a rainbow. It is
  also the order of visible light in the
  electromagnetic spectrum.

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• Each color refracts at a different angle because
  of their different wavelengths.

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• Red is first because it has the longest
  wavelength so it bends the least. Blue bends
  most because it has the shortest wavelength.