Section 3: Interactions of Waves

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Presentation transcript:

Section 3: Interactions of Waves Do Now: With your teammates – review HL#4 RR: Share any questions your teammates have Cornell Notes: 12/3/15 - FQ What causes waves to change directions?

Reflection (Station 1) When an object or a wave hits a surface through which it cannot pass, it bounces back, or reflects Ball hitting a wall Light in the mirror Echoes Water hitting barrier

Reflection Vocabulary Incident wave or Incoming wave Reflected wave Normal line or Perpendicular line Angle of incidence Angle of reflection The Law of Reflection states that the angle of incidence equals the angle of reflection

Reflection How can we use the Law of Reflection to play a game of pool (billiards)? Draw a sketch of reflection on a pool table…and discuss it with your partner. I want to see ANGLES!!!!!! Follow-up Question: Explain the strategies you used to play virtual pool and relate them to the law of reflection.

Refraction

Refraction (Station 3) Def.: When a wave enters a new medium at an angle, one side of the wave changes speed before the other side, causing the wave to bend This bending only occurs when the wave enters the medium at an angle

Diffraction (Station 6) When a wave moves around a barrier or through an opening in a barrier, it bends and spreads out, or diffracts. This behavior indicates that light travels in waves….

Interference The interaction between waves that meet Constructive Destructive

Standing Waves If two waves coming from opposite directions have just the right frequency, they produce a combined wave that appears to be standing still Standing wave – a wave that appears to stand in one place even though it is really 2 waves interfering as they pass through each other Nodes – points of zero amplitude, always evenly spaced Antinodes – points of maximum amplitude & maximum energy Standing waves video on YouTube

Resonance Resonance Video Breaking Glass with Sound An increase in the amplitude of a vibration that occurs when external vibrations match an object’s natural frequency When do you push someone on a swing? Resonance Video Breaking Glass with Sound Tacoma Narrows Bridge Collapse