Warm Up ) 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 ) 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 ) 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 Interference Reflection Refraction Diffraction Absorption Polarization 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
Crest to Crest Trough to Trough
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
Glass 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 VIDEO