Test 2 News Test 2 News Keep your Tests in your notebook Keep your Tests in your notebook but return your Scantron forms but return your Scantron forms and the Manipulative. and the Manipulative. Some of the questions will Some of the questions will appear on the comprehensive appear on the comprehensive final. final. Discuss questions that you Discuss questions that you missed with your team mates. missed with your team mates.
Test 2 News. Keep your Tests in your notebook but return your Scantron forms and the Manipulative. Some of the questions will appear on the comprehensive final. Discuss questions that you missed with your team mates. The Plan. Locate your name tag. - PowerPoint PPT Presentation
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Test 2 NewsTest 2 News
Keep your Tests in your notebook but Keep your Tests in your notebook but return your Scantron forms and the return your Scantron forms and the Manipulative.Manipulative.
Some of the questions will appear on Some of the questions will appear on the comprehensive final.the comprehensive final.
Discuss questions that you missed Discuss questions that you missed with your team mates.with your team mates.
The PlanThe Plan
Locate your name tag.Locate your name tag. Remove the team role name and Remove the team role name and
leave it on the desk in front of leave it on the desk in front of you.you.
Leave the team name sign on the Leave the team name sign on the desk as well.desk as well.
• ConesCones - color receptors - color receptors– Three Types: Red, Green, BlueThree Types: Red, Green, Blue
• Cones are more numerous in the center of Cones are more numerous in the center of your vision.your vision.
• Rods are more numerous around the Rods are more numerous around the periphery of your vision.periphery of your vision.
• Demo – Moving markers near peripheryDemo – Moving markers near periphery
Color DeficiencyColor Deficiency
Color VisionColor Vision Colorblindness - about 10% of populationColorblindness - about 10% of population
Red-green is predominantRed-green is predominant Yellow-blue - a fewYellow-blue - a few
What is color?What is color? Different wavelengths of light are Different wavelengths of light are
perceived as different colors. perceived as different colors.
White light contains equal amounts of White light contains equal amounts of these colors. (ROY G. BIV)these colors. (ROY G. BIV)
Fill in the BlanksFill in the Blanks
Black objects _______ all of the pure Black objects _______ all of the pure colors.colors.
White objects _______ all of the pure White objects _______ all of the pure colors.colors.
Transparent objects _______ all of the Transparent objects _______ all of the pure colors.pure colors.
absorb
reflect
transmit
Color FiltersColor Filters
Red filtersRed filters transmit red light and absorb transmit red light and absorb the other colors.the other colors.
Red objectsRed objects reflect red light and absorb reflect red light and absorb the rest.the rest.
In red light, what color do the red petals In red light, what color do the red petals and green leaves of rose appear?and green leaves of rose appear?
Color FiltersColor Filters Red filtersRed filters transmit red light and absorb the transmit red light and absorb the
other colors.other colors.
Red objectsRed objects reflect red light and absorb the reflect red light and absorb the rest.rest.
In red light, what color do the red petals and In red light, what color do the red petals and green leaves of rose appear?green leaves of rose appear?– Answers: Answers:
Petals appear redPetals appear red Leaves appear to be blackLeaves appear to be black
Color FiltersColor Filters
The following color filters are yours to The following color filters are yours to keep in the zip-lock bags:keep in the zip-lock bags:– Red, Green, BlueRed, Green, Blue– Yellow, Magenta, CyanYellow, Magenta, Cyan
FlashlightsFlashlights
All flashlights must work for this All flashlights must work for this exercise.exercise.
Mixing Colored Light Mixing Colored Light Color AdditionColor Addition
Additive Primary Colors: Additive Primary Colors: RedRed GreenGreen Blue Blue
One can produce any color by varying One can produce any color by varying amplitude and mixture or red, green amplitude and mixture or red, green and blue light.and blue light.
Color Addition Examples: Color Addition Examples:
– Tiny dots called pixels on Color TV's and Tiny dots called pixels on Color TV's and Computer Monitors are colored only red, Computer Monitors are colored only red, green, or blue.green, or blue.
““White Light” and “Color Addition White Light” and “Color Addition Wheels”Wheels”– Everyone will color Roy G. Biv onto the 7 Everyone will color Roy G. Biv onto the 7
segment wheel.segment wheel.– XO Red + Blue = ?XO Red + Blue = ?– COCO Red + Green = ?Red + Green = ?– ENGENG Blue + Green = ?Blue + Green = ?– COM Red + Blue + Green = ?COM Red + Blue + Green = ?
One can produce any color by varying One can produce any color by varying the amount of yellow, magenta and the amount of yellow, magenta and cyan pigments.cyan pigments.
Color Subtraction Examples: Color Subtraction Examples:
– Newspapers, magazines, booksNewspapers, magazines, books– Zip-lock with colored sealsZip-lock with colored seals
– Color Subtraction EquationsColor Subtraction Equations
Color Subtraction Color Subtraction Using CrayonsUsing Crayons
Lab ExerciseLab Exercise
ChromatographyChromatography
Lab ExerciseLab Exercise
White
Red
Green
Blue
Yellow
Cyan
Magenta
Primary Colors
Green
Pure Green
Color AdditionPrimary Green
Complementary ColorsComplementary Colors - any two colors - any two colors that add together to produce whitethat add together to produce white
e.g. magenta + green = whitee.g. magenta + green = white
Physics
Engineering
Astronomy
And our flag was still there...
SpiralSpiral
After Images and “Conal After Images and “Conal Fatigue”Fatigue”
The human eye will see The human eye will see complimentary colors after staring complimentary colors after staring at a color picture.at a color picture.
Demos:Demos: Colored ShapesColored Shapes Texas FlagTexas Flag American FlagAmerican Flag RoseRose LincolnLincoln
Lab SupplementLab Supplement
Color a Flag with Complementary Color a Flag with Complementary ColorsColors– Move this page forwardMove this page forward– What color would we use so that the What color would we use so that the
afterimage is red, white and blue?afterimage is red, white and blue?– Write this on the supplement: Write this on the supplement:
Complementary ColorsComplementary Colors Use cyan, black, and green get an after Use cyan, black, and green get an after
image that is red, white and blue.image that is red, white and blue.
• The SPF of a sunscreen is a laboratory measure of The SPF of a sunscreen is a laboratory measure of the effectiveness of sunscreen; the higher the SPF, the effectiveness of sunscreen; the higher the SPF, the more protection a sunscreen offers against UV-the more protection a sunscreen offers against UV-B (the ultraviolet radiation that causes sunburn). B (the ultraviolet radiation that causes sunburn).
• The SPF indicates the time a person can be The SPF indicates the time a person can be exposed to sunlight before getting sunburn with a exposed to sunlight before getting sunburn with a sunscreen applied relative to the time they can be sunscreen applied relative to the time they can be exposed without sunscreen. exposed without sunscreen.
• For example, someone who would burn after 12 For example, someone who would burn after 12 minutes in the sun would expect to burn after 2 minutes in the sun would expect to burn after 2 hours (120 min) if protected by a sunscreen with hours (120 min) if protected by a sunscreen with SPF 10.SPF 10.
The Visible Spectrum
A range of light waves extending in wavelength from about 400 to 700 nanometers.
Things that create a Spectrum
Prism Raindrops CD’s Spectroscopes
Contains a Diffraction Grating
Diffraction Gratingfor Ziplock Bag
Creating a Spectroscope Roll up and tape black paper to form a tube. Cover end of the tube with foil. Use a blade to make a slit in the foil. Temporarily tape the diffraction grating over
the other end of the tube. Observe several light sources.
Incandescent Light, Florescent Light, Neon Sign
Object Names Blue Bowl Red Bowl Yellow Post-it Orange Post-it
http://sciencekit.com/
Object Names Red Filter Green Filter Yellow Filter Cyan Filter
Robert BunsenGustav Kirchhoff
“The Taste Test”versus
“The Flame Test”
Continuous Spectra Hot, dense solids produce a continuous spectrum.
(All Colors)
Hot gas produces a bright line emission spectrum.
(Bright Lines)
Emission Spectra
Filters behind continuous sources give absorption spectrum.
(Missing Colors)
Absorption Spectra
Example Questions What type of spectra do each of the following have?
A lens that is thicker in the middle and refracts parallel light rays passing through to a focus.
Diverging Lens A lens that is thinner in the middle than at the
edges, causing parallel light rays to diverge.
Team Exercise: Lens sorting
Myopia (Near-Sightedness)
People with near-sightedness cannot see clearly at distance.
What kind of corrective lens will they need?
Hyperopia (Farsightedness)
People with far-sightedness cannot see clearly up close.
What kind of corrective lens will they need?
“Where is the Image?”Lab Exercise
“Making a Telescope”Lab Exercise
Total Internal Reflection... …is the total reflection of light traveling in a
medium when it strikes a surface of a less dense medium
Demo - Laser and light pipe Example: Optical Fiber Ring
Laser Underwater Movie
Woman Edge Pool Movie
WATER
AIR
Light Source
Critical Angle
Total Internal Reflection
Atmospheric Refraction Our atmosphere can bend light
and create distorted images called mirages.
http://astro.sfasu.edu/movies/Highway Mirage 1.mpg What causes stars to twinkle?
Atmospheric Turbulence
Mirage
Warm air
Cool air
Earth
Sun
Sun
Because of atmospheric refraction, we have lingering, elliptical sunsets.
Why is the sky blue?Why is the sky blue?
Nitrogen and Oxygen in our Nitrogen and Oxygen in our atmosphere atmosphere scatterscatter high high frequencies of light.frequencies of light.
Why are sunsets Why are sunsets red?red? Red light is scattered the least by our Red light is scattered the least by our
atmosphere. atmosphere.
The greatest path of sunlight through The greatest path of sunlight through the atmosphere is at sunset or the atmosphere is at sunset or sunrise.sunrise.
Why are clouds Why are clouds white?white?
The color of light scattered by clusters of The color of light scattered by clusters of water molecules vary with the size of the water molecules vary with the size of the clusters.clusters.
The size of clusters of water molecules The size of clusters of water molecules (droplets) vary in clouds.(droplets) vary in clouds.
Why is the ocean Why is the ocean greenish blue?greenish blue? Red light is absorbed by the Red light is absorbed by the
molecules in the water.molecules in the water.
Review for Test 3Review for Test 3
Chapter 14Chapter 14– ColorColor
Chapter 15Chapter 15– RefractionRefraction
Chapter 18Chapter 18– SpectraSpectra
Chapter 14Chapter 14 Section 14.3 through 14.8Section 14.3 through 14.8
– Selective ReflectionSelective Reflection– Selective TransmissionSelective Transmission– Color AdditionColor Addition– Color SubtractionColor Subtraction– Complementary ColorsComplementary Colors– Conal FatigueConal Fatigue– Why is the sky blue?Why is the sky blue?– Why Sunsets are RedWhy Sunsets are Red
Chapter 15Chapter 15 Section 15.2 through 15.6Section 15.2 through 15.6
– Refraction - BendingRefraction - Bending– Speed in different mediaSpeed in different media– Apparent Water DepthApparent Water Depth– Illusions and MiragesIllusions and Mirages– Atmospheric RefractionAtmospheric Refraction– DispersionDispersion– RainbowsRainbows– Lenses and TelescopesLenses and Telescopes– Your EyeYour Eye– Image FormationImage Formation
ExercisesExercises Bob the Builder and Filter GlassesBob the Builder and Filter Glasses ““Goggles” - SupplementGoggles” - Supplement ““Kaleidoscope”Kaleidoscope” ““Animal Shadow”Animal Shadow” ““Prism Power”Prism Power” ChromatographyChromatography
Diffraction a modification which light undergoes in
passing by the edges of bodies or through narrow slits
…and in which the rays appear to be deflected and to produce fringes of parallel light and dark or colored bands
Water Wave Interference Movie
Multiple Slit Interference Movie
Doppler Effect the change in wavelength due to motion of
the source or observer
"Wheeeeeeeeeeee…….Oooooooooooooo”
Examples: Water, Sound, and Light
Source at Rest
Wavelength
What happens when the source in in motion?
Movie #1Movie #1
Java
Source in Motion
Short Wavelength
High Frequency
High Pitch
Weeeeeeeee!!!
Long Wavelength
Low Frequency
Low Pitch
Ooooooo!!!
As a team, describe what happens to the wavelength, frequency, and pitch both in front of and behind a moving sound source.
Doppler Effect Examples:
moving cars and trains Sound Movie #2
moving buzzer in a nerf ball (in class)
Chapter 14 & Chapter 14 & 1515
Light and ColorLight and Color
Be prepared to turn in your notebook at the beginning of Test 3.Be prepared to turn in your notebook at the beginning of Test 3.It will be returned at the end of Test 3.It will be returned at the end of Test 3.
Please keep your notebook after that for your future class.Please keep your notebook after that for your future class.
Test 3 Test 3
• Everyone starts Test 3 at 1pm.Everyone starts Test 3 at 1pm.
• Manipulative Manipulative – Transparent, Translucent, OpaqueTransparent, Translucent, Opaque– Spectra, Color, and LensesSpectra, Color, and Lenses– Pendulum (Optional)Pendulum (Optional)