WAVES
Learning Target(s): Students can explain how waves interact when they meet an dostacle.
Students can explain what happens when two waves interfere.
VOCABULARY
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reflection- the throwing back by a body or surface of light, heat, or sound without absorbing it.
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diffraction- the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle.
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refraction-is the bending of a wave when it enters a medium where its speed is different.
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interference- is the phenomenon that occurs when two waves meet while traveling along the same medium.
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constructive interference- is a type of interference that occurs at any location along the medium where the two interfering waves have a displacement in the same direction.
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destructive interference- is a type of interference that occurs at any location along the medium where the two interfering waves have a displacement in the opposite direction.
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standing waves​- a wave in a medium in which each point on the axis of the wave has an associated constant amplitude.
DESTRUCTIVE
a type of interference that occurs at any location along the medium where the two interfering waves have a displacement in the same direction.
BOTH
Takes place where waves meet.
CONSTRUCTIVE
occurs at any location along the medium where the two interfering waves have a displacement in the opposite direction.
Ex of Reflection: Light wave bouces off mirror.
Demonstration: The light is reflected on surface/interface between two diff materials, Light & mirror.
Ex of Refraction: Having a glass of water and putting a pencil inside of it will make it look like its bend.
Demonstration: light passes through materials like glass or water it slows down the waves creating the bend.
Diffraction
Ex: A CD because it forms a rainbow type pattern.
Demonstration:diffraction happens when a wave bends around an obstacle creating the rainbow on the CD as you look at it.
Standing Wave
Ex: Vibration of a violin string & the electron orbitals in an atom.
How: This occurs because the waveform is reflected back to itself.
this video gives the defenition of the words listed above. It all also gives and example of each. It gives an illustration of the words to give a better understanding of it.
Without the wall, the sound waves would travel outwards away from the source indefinitely. Because of the wall, a reflected wave appears and interferes with the wave. an example of this is a drop of water spreading and being interfered by anothoer drop of water spreading.
