How do waves behave
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How do waves behave

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  • Why can you hear noises from down the hall or from another room? Sound waves must be able to bend around the door and reach your ears

How do waves behave Presentation Transcript

  • 1. How do waves behave?
    7SCIENCE Thurs. May 11
  • 2. Review
    Where can you find the amplitude on a wave?
    Distance halfway between the crest and trough
    What does a high/low amplitude mean?
    High amplitude = wave has more energy
    Low amplitude = wave has less energy
    How do you measure a wavelength?
    From trough to trough or crest to crest
    How does wavelength relate to frequency?
    If a wave has a long wavelength, it will have a low frequency
  • 3. Wave behavior
    Waves act in many different ways (ex. sound waves and light waves), and may produce a:
    Reflection
    Refraction
    Diffraction
    Interference
  • 4. Wave behavior:Reflection
    Echoes: an echo is an example of reflected sound
    Reflection occurs when a wave strikes an object or surface and bounces off
    Example: light waves reflect from your face and strike the mirror, bounce off and reflect into your eyes
  • 5. Wave behavior: Refraction
    Light waves change direction when they are reflected but can also change when passing through a different substance
    Refraction occurs when a wave bends as it moves from one substance into another
    Ex: pencil/straw in clear glass of water, fish in water look closer than they really are
    Waves will speed up or slow down depending on the substance, and bend in different ways
  • 6. Wave behavior: Diffraction
    Diffraction occurs when waves bend around a barrier
    Ex: you can hear sound from another room even though you are far away
    Does light diffract?
    Ex: you can’t see the people in a room until you are at the door
    Answer: Light diffracts a small amount because its wavelengths are much shorter than sound and cannot bend easily around corners, like through a door
  • 7. Wave behavior: Interference
    Interference occurs when two or more waves combine to form a new wave
    Ex: when many trumpets play the same note at the same time, the waves combine to form a wave with a larger amplitude
    Ex: light waves experience interference on CDs to produce the many different colors
    Interference is used in ear plugs, which reflect and absorb some of the harmful sound waves