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Group Work Why do cooler objects emit a greater fraction of their energy at long wavelengths (low frequencies)?
Light and Color Chapters 26–27
Today’s Objectives Explain how the human eye identifies colors. Explain how colors are produced by absorption, dispersion, and scattering.
How Human Color Vision Works Source: Griffith, Physics of Everyday Phenomena
Poll Question What color do we see when green and red receptors are stimulated equally? A. Cyan. B. Blue. C. Yellow. D. Magenta.
Poll Question What color do we see when blue and red receptors are stimulated equally? A. Cyan. B. Blue. C. Yellow. D. Magenta.
Bird and Reptile Color Vision Source: Scientific American, July 2006
Reflection and Transmission (and absorption)
Chlorophyll absorbs blue and red light. What color does it appear? A. red B. yellow C. green D. violet Poll Question
In color printing, which two color inks are combined to make the color orange? Poll Question A.Cyan and Magenta. B.Cyan and Yellow. C.Yellow and Magenta.
Fluorescent Light Not “Natural” Source:
Colors Split by Dispersion Source: Griffith, Physics of Everyday Phenomena, 4 ed.
Speed in Glass Depends on Index of refraction n = c/v c = vacuum speed v = speed in medium
Poll Question Which is faster in glass? 1.Blue light. 2.Red light. 3.Both have the same speed.
Source: Griffith Prism Separates White Light
Board Work What is wrong with this famous picture?
Dispersion Creates Rainbows Source: Griffith
Primary Rainbow: 1 Reflection Source: Griffith, Physics of Everyday Phenomena 40° 42°
Secondary Rainbow: 2 Reflections Source: Griffith 54.5° 52°
Viewing Both Rainbows Source: Ackerman and Knox, Meteorology
Rayleigh Scattering Why the sky is blue and sunsets are red
Blue Scatters; Red Passes Source: Griffith
Reading for Next Time Atomic Structure –Nuclear composition –Naming isotopes Radioactivity –Nuclear forces –Half-life –Decay types
Light (or the ELECTROMAGNETIC SPECTRUM). The Visible Light Spectrum.
Copyright © Houghton Mifflin Harcourt Publishing Company Unit 3 Lesson 2 Interactions of Light.
Electromagnetic Waves and Light. Electromagnetic Waves Electromagnetic waves do not require a medium to travel. They are created by oscillating (moving)
Electromagnetic Radiation is just a name for the range of radiation….(feel free to start singing) Light is both a particle and a wave Light particles.
Waves, Sound, and Light Chapter 3. Bell Work 11/29/10 Please get a new bell work sheet. Write each statement then decide if they are true or false, if.
Light as a Wave Part 2 SNC2D. The Speed(s) of Light Light will travel slower in denser media (e.g. glass), but the speed in air is still effectively 3.0.
Light interacts with matter in 4 known ways. It sometimes bounces off matter. Sometimes it is absorbed by matter. In some cases it passes through.
Lots of fun! Win valuable prizes!. 1. The main difference between a radio wave and a light wave is its A. wavelength. B. speed. C. Both A and B D. None.
Properties and Characteristics. What do we know about EM waves in general? They are ALL EnergyRadiation! Non-mechanical Transverse waves –They do not.
An Introduction to Mixing Colors. What happens if you mix colors of paint? Half of you will mix blue, red, and yellow acrylic paints from Michaels ($1.49.
COLOR and Light February 6, How does light interact with matter? O Light can interact 3 ways: O 1. reflected – light waves bounce of objects O 2.
COLORCOLOR. COLORCOLOR Why do I see all those pretty colors?
Chapter 11 Sound and Light Beginning on page 35 of your packet.
Light Waves What we call light is a small portion of the electromagnetic spectrum What we call light is a small portion of the electromagnetic spectrum.
Interactions of Light with Matter Chapter 3 Section 2.
Electromagnetic waves- transverse waves consisting of changing electric and magnetic fields Carry ENERGY from place to place Different from mechanical.
Light A light source produces light. Sources of light…
Light I.Electromagnetic Radiation EM Radiation EM Spectrum Types of EM Radiation.
Fundamentals of Light. Light Light is not only comprised of the light we can see (visible light), but also other types of light waves, called EM waves.
Electromagnetic Waves G1 – The nature of EM waves and light sources.
Principles of Light The Science Behind Photography.
The energy that comes from the sun is called electromagnetic radiation. This energy is carried by several waves with different wavelengths and frequencies.
© Boardworks Ltd of 20 © Boardworks Ltd of 47 KS3 Physics 8K Light.
What is light? We see light as color and brightness It’s actually electromagnetic radiation: Partly electric, partly magnetic Flows in straight line (radiates)
Properties of Light. What is light? It is a small part of the EM spectrum, but it is the one we are most familiar with. How fast does light travel? The.
Chapter 10 Light. Reflection & Mirrors When light strikes an object It is either reflected, absorbed or transmitted. Opaque: a material that reflects.
What is Light?. What Is Light? Energy! Energy…. Usually needs a medium for transmission. Ex. Heat transfers by convection or conduction.
Chapter 26 Properties of Light. James Clerk Maxwell discovered that light is composed of a.electromagnetic waves. b.ultrasonic waves. c.infrasonic waves.
1 Light By Mike Maloney. © 2003 Mike Maloney2 Light What is LIGHT? WHERE DOES IT COME FROM?
Electromagnetic Spectrum © 2000 Microsoft Clip Gallery.
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