Wave Interactions.

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Presentation transcript:

Wave Interactions

Reflection The interaction of a wave with a surface it cannot pass through. Causes the wave to bounce back. Ex: Looking in a mirror – light Ex: Echo – sound Law of reflection – The angle the wave comes in at (incidence) = the angle the wave will be reflected at.

- Interactions of Waves Refraction

Refraction Occurs when: AND The bending of waves. Due to a change in speed. Occurs when: Enters a new medium Enters it at an angle AND One side of the wave enters first and changes speed first, causing the wave to bend.

Diffraction When a wave moves around a barrier When a wave moves through a hole or opening in a barrier. OR

- Interactions of Waves Diffraction

Interference Interaction between waves that meet (run into each other) 2 types Constructive (build up) Destructive (tear down)

Constructive Interference - Interactions of Waves Constructive Interference When waves combine to make a wave with a larger amplitude. When crest meets crest or trough meets trough. Add their energies

Destructive Interference The interference that occurs when waves combine to make a wave with a smaller amplitude. Subtract their energies

Standing Waves A wave that appears to stand still in one place. Actually 2 waves interfering as they pass through each other. When an incoming wave meets a reflected wave at just the right frequency.

Standing waves cont. Node: Point of zero amplitude on a standing wave. Min. energy Antinode: Point of maximum amplitude on a standing wave. Max. energy

Resonance When external vibrations match an objects natural frequency Increases the amplitude of the vibration