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Waves!

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Transcript

  • 1. Waves!
    7SCIENCE Thurs. May 5th, 2011
  • 2. What are waves and how are they related to matter?
    Waves are regular disturbances that carry energy through matter or space without carrying matter
    Ex: when you listen to music the speakers vibrate and create sound waves that reach your ears
    Ex: When you kick a soccer ball to a friend you are transferring energy (feel the force of the ball) as well as matter (ball)
  • 3. Main Types of Waves
    Mechanical
    Electromagnetic
    Transverse
    Compressional
    Compressional Waves
  • 4. Mechanical Waves
    Waves that require matter to carry energy are called mechanical waves
    Ex: sound travels through air (matter) from gas molecule to gas molecule to your ears
    Without air, you would not hear sounds
    When we drop water into the plate, this energyis transferred from molecule to molecule of water and creates waves
  • 5. Electromagnetic Waves
    Waves that do not require matter to carry energy are called electromagnetic waves
    Ex: radio, TV, microwave, x-rays, Sun
    Ex: Can travel through the walls of your home and places like space
  • 6. Transverse Waves
    Mechanical transverse waves, matter moves back and forth
    All electromagnetic waves are transverse
    Diagram: The high part of a transverse wave is called the crest. The low part of a transverse wave is the trough. The amplitude of the wave is the distance the crest rises above or the trough falls belowthe wave’s center line.
    Amplitude
  • 7. Compressional Waves
    Mechanical waves can be transverse or compressional
    Compressional waves move matter forward and backward in the same direction the wave travels
    Ex: spring toy
    Only carries energy forward, the spring does not move along with the wave
    Ex: Sound waves are compressional waves
  • 8. Sound Waves
    How do we make sound waves? Ex: drum
    When a drum is not being played the air particles are spread the same distance apart
    When the drum is hit, the surface moves down and the air particles move away from each other
    When the drum’s surface moves back up, the air particles are squeezed together
    The air particles transfer the sound energy through the air and to your ear