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Ch 15.3

Ch 15.3. Wave Interactions. Wave Interaction. All we have left to discover is how waves interact. When two waves meet while traveling along the same medium it is called INTERFERENCE. Wave Interference. When two waves pass each other their superposition causes reinforcement or cancellation.

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Ch 15.3

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  1. Ch 15.3 Wave Interactions

  2. Wave Interaction All we have left to discover is how waves interact. When two waves meet while traveling along the same medium it is called INTERFERENCE.

  3. Wave Interference When two waves pass each other their superposition causes reinforcement or cancellation.

  4. Interference • the result of two or more sound waves overlapping

  5. Constructive Interference Let’s consider two waves moving towards each other, both having a positive upward amplitude. What will happen when they meet?

  6. Constructive Interference They will ADD together to produce a greater amplitude. This is known as CONSTRUCTIVE INTERFERENCE.

  7. Constructive Interference Reinforcement when the crest of one wave overlaps the crest of another Their individual effects add together, resulting in a wave increased in amplitude

  8. Destructive Interference Now let’s consider the opposite, two waves moving towards each other, one having a positive (upward) and one a negative (downward) amplitude. What will happen when they meet?

  9. Destructive Interference This time when they add together they will produce a smaller amplitude. This is known as DESTRUCTIVE INTERFERENCE.

  10. Destructive Interference Cancellation when the crest of one wave overlaps the trough of another reducing their individual effects Water waves show these best Out of phase- the crest of one wave arrives at a point at the same time as a trough of the second wave arrives, effects cancel each other In phase- two waves crests and troughs arrive at a place at the same time, effects reinforce each other

  11. Waves can be both constructive and destructive

  12. Standing Waves Occur when a wave reflects upon itself and interference causes the pattern Nodes remain stationary Anti nodes-occur half way between nodes

  13. Standing Waves Change the frequency in a standing wave and more nodes/antinodes appear in the event

  14. Visual Concept: Standing Wave

  15. Check Your Understanding Which points will produce constructive interference and which will produce destructive interference? • Constructive • G, J, M, N • Destructive • H, I, K, L, O

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