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

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

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