Interference

Physicswavesinterference
1.0x

Interference

Created 3 years ago

Duration 0:11:36
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Slide Content
  1. Warm Up

    Slide 1 - Warm Up

    • Go to
    • http://www.theuniverseandmore.com/
    • Click Wave applet
    • Use the applet to decide who is correct.
  2. Interference

    Slide 2 - Interference

  3. Slide 3

    • interference is when two waves combine to form a resultant wave of greater or lower amplitude.
  4.       Constructive interference

    Slide 4 - Constructive interference

    • When two waves meet, they interfere with each other.
    • If they meet each other exactly in phase, the amplitudes ‘add up’ to produce large crests and troughs.
    • +
    • =
    • This is called constructive interference.
  5. CONSTRUCTIVE INTERFERENCE

    Slide 5 - CONSTRUCTIVE INTERFERENCE

    • larger displacement (larger amplitude)
    • crest overlaps crest 
    • or trough overlaps trough
  6.       Destructive interference

    Slide 6 - Destructive interference

    • This is called destructive interference.
    • If two waves meet each other exactly out of phase, the amplitudes ‘subtract’ to produce no peaks or crests.
    • +
    • =
  7. DESTRUCTIVE INTERFERENCE

    Slide 7 - DESTRUCTIVE INTERFERENCE

    • smaller displacement (smaller amplitude)
    • crest cancels trough 
    • crest overlaps trough 
    • displacement/ amplitude is reduced
  8. This is how noise canceling headphones work!

    Slide 8 - This is how noise canceling headphones work!