SP4 Students will investigate the properties of waves.
Post on 16-Dec-2015
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Warm-up:
1. An electromagnetic wave begins with an electricCharge (like an electron).
2. The electric charge has an electric field
3. The electric field creates a magnetic field
4. These fields are perpendicular to each other
5. This transverse wave has a wave length.
Austin Lanham’s Quantum Physics’ DoubleSlit Experiment
Objects can absorb light, reflect light, and transmit light depending on the typeof matter they are made of.
A. Reflection
• Reflection– when a wave strikes
an object and bounces off
incident beam reflected beam
Normal
B. Refraction
• Refraction– bending of waves when passing from
one medium to another– caused by a change in speed
• slower (more dense) light bends toward the normal
SLOWER
FASTER
• faster (less dense) light bends away from the normal
B. Refraction
• Example:
View explanation.
Every material has an index of refraction, the larger the index, the greater the amount by which the speed of light is reduced.
Car side mirrors do not work when theyare covered in frost. What does frostdo to the surface of a mirror to causediffuse reflection?
Each wave length of visibleLight is a different color.When an object reflects that wavelength weSee that particular color.
B. Seeing Colors
• White light– contains all visible colors - ROY G. BIV
• In white light, an object…– reflects the color you see– absorbs all other colors
REFLECTSALL COLORS
ABSORBSALL COLORS
B. Seeing Colors
• The retina contains…– Rods - dim light, black & white– Cones - color
• red - absorb red & yellow• green - absorb yellow & green• blue - absorb blue & violet
Stimulates red & green cones
Stimulates all cones
B. Seeing Colors
• Color Blindness– one or more sets of cones
does not function properly
Test for red-green color blindness.
C. Mixing Colors
• Primary light colors– red, green, blue– additive colors– combine to form white light
View Java Applet on primary light colors.
EX: computer RGBs
C. Mixing Colors
• Filter– transparent material
that absorbs all light colors except the filter color
View Java Applet on filters.
C. Mixing Colors
Light Pigment
When mixing pigments, the color of the mixture is the color of light that both pigments reflect.
C. Mixing Colors
• Pigment– colored material that absorbs
and reflects different colors
• Primary pigment colors– cyan, magenta, yellow– subtractive colors– combine to form black
EX: color ink cartridges
A filter is a translucent material that lets oneor more colors pass through, but absorbsthe rest. The color of a filter is the colorof light that it lets through.
If you looked at green grass with redSun glasses, the grass would look black.
The color green reflected to your eyesWould be absorbed by the glasses.Since the glasses only let red light through.
Choices
• A – Home interior presentation
• B – Teaching a class of Bass Pro Shop on the art of spear fishing
• C – Teaching a 4th grade class on mirrors
Groups: Choice A Soft Blue Book page 212Using the materials provided you, preparea home interiors presentation on the following:
The types of windows available for an upstairsbathroom. Based on the science of light, and thecustomers’ needs, explain which window worksbest under certain conditions.
Choice B
You are making a presentation and teaching a class for Bass Pro Shop on the art of spear fishing.
Be sure to discuss the behavior of light in different mediums and the index ofrefraction using the materials provided you.
Choice C
You are teaching a 4th grade class on mirrors.Design a hands on activity using the materialsprovided for your students to learn aboutthe laws of regular and diffused reflection.You might want to use a County Fair themeand make a fun house with different kinds of mirrors.
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