wave properties 2

wave properties 2

1. superposition

   • when waves meet, they pass through each other
     • at the point where they meet, they combine for an instant before they move apart
   • principle
     • when two waves meet, the total displacement at a point is equal to the sum of the individual displacements at that point
     • when crest meet
       • supercrest created
     • trough meet trough
       • supertrough created
     • when crest meet trough
       • resultant displacement is 0
         • waves cancel

2. stationary waves on a rope

   • formed if two pple send waves continously along a rope
   • two sets of waves
     • progressive waves
       • combine at fixed points along the rope to form nodes (no displacement)

3. water waves in a ripple tank

   • points of cancellation
     • when a crest from one dipper meets a trough from the other dipper
   • points of reinforcement
     • when a crest from a dipper meets a crest from another dipper
   • waves pass at constant frequency and at constant phase difference
     • cancellation and reinforcement occurs at fixed positions
       • interference

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