Wave Interactions

Warm Up 11-6-151) What type of wave is sound? (Transverse or Longitudinal) What is the medium that sound travels through?

2) If I had a black plate and a white plate, which do you think would get hotter sitting in the sun? Why?

7) If I had a red plate and a violet plate, which do you think would get hotter sitting in the sun? Why?

19) If I am wearing a yellow shirt, which color(s) of visible light are reflected off of it? Which color(s) are absorbed by it?

28) If I have a machine that emits Radio Waves and Ultra Violet waves and I point it at the moon, which wave will arrive there first?

Warm Up 11-6-151) What type of wave is sound? (Transverse or Longitudinal) What is the medium that sound travels through?

2) If I had a black plate and a white plate, which do you think would get hotter sitting in the sun? Why?

3) If I had a red plate and a violet plate, which do you think would get hotter sitting in the sun? Why?

4) If I am wearing a yellow shirt, which color(s) of visible light are reflected off of it? Which color(s) are absorbed by it?

5) If I have a machine that emits Radio Waves and Ultra Violet waves and I point it at the moon, which wave will arrive there first?

Warm Up 11-6-151) What type of wave is sound? (Transverse or Longitudinal) What is the medium that sound travels through?

2) If I had a black plate and a white plate, which do you think would get hotter sitting in the sun? Why?

3) If I had a red plate and a violet plate, which do you think would get hotter sitting in the sun? Why?

4) If I am wearing a yellow shirt, which color(s) of visible light are reflected off of it? Which color(s) are absorbed by it?

5) If I have a machine that emits Radio Waves and Ultra Violet waves and I point it at the moon, which wave will arrive there first?

6 Wave Interactions

InterferenceReflectionRefraction

DiffractionAbsorptionPolarization

•When a wave encounters a surface, 6 interactions can occur

Interference• Interference – when two or more waves meet in the

same medium

– Constructive Interference – when two waves add up to make a larger wave amplitude

Constructive

–Destructive Interference – when waves add up to make a smaller or zero wave amplitude (cancel each other out)

Destructive

Constructive Interference

Constructive Interference

Crest to Crest Trough to Trough

Destructive Interference

Destructive Interference

Crest to Trough

Result of Interference• Resonance – occurs when

vibrations travelling through an object match the object’s natural frequency–Also occurs when one object

vibrates another object without touching it

Result of Resonance

Result of ResonanceGlass shattering

Tacoma Narrows Bridge collapsing

Tuning forks vibrating

Reflection• Reflection – when a wave bounces

off a material and goes in a new direction

Refraction• Refraction – when a wave passes

through a different material and bends

Refraction

Diffraction• Diffraction – when a wave bends

around or goes through a hole in a material

Absorption• Absorption – when a wave is

absorbed by the material and may disappear

Polarization• Polarization – when waves move as

a transverse and longitudinal waves but only one can get through

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