Wave Interactions. Reflection The interaction of a wave with a surface it cannot pass through. The...
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Transcript of Wave Interactions. Reflection The interaction of a wave with a surface it cannot pass through. The...
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 The bending of waves. Due to a change in speed. Occurs when:
Enters a new medium
Enters it at an angleAND
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)
- 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
• The interference that occurs when waves combine to make a wave with a smaller amplitude.
• Subtract their energies
Destructive Interference
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