Waves Teaching Slides, 3.2 If you are using the PowerPoint slides, log in to your FOSSweb account on your internet browser. Then, cut and paste these links.

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Waves Teaching Slides, 1.1 If you are using the PowerPoint slides, log in to your FOSSweb account on your internet browser. Then, cut and paste these links.
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Waves Teaching Slides, 3.2 If you are using the PowerPoint slides, log in to your FOSSweb account on your internet browser. Then, cut and paste these links into your browser. Resources by Investigation provides access to all notebook masters, teacher masters, online activities, and video content: http://www.fossweb.com/resources-by-investigation?folioID=G4335255&parentID=G4324864 The eBook provides access to all FOSS Science Resources articles: http://www.fossweb.com/delegate/ssi-wdf-ucm-webContent/ Contribution%20Folders/FOSS/ebooks_NG/Waves_NG_SRB/Waves_SRB.html If you are using the PDF versions of the slides, simply log in to your FOSSweb account before starting; the embedded links will take you directly to the Resources by Investigation and the eBook. If you plan to use these slides offline, be sure to plan ahead and download the necessary duplication masters from the Resources by Investigation section of FOSSweb. Waves Course, 3.2: Spectra

Science Log Q4 week 6 Wednesday: What is the relationship between the angle of incidence and the angle of reflection with light? What is that called? The angle of incidence equals the angle of reflection. This is called the law of reflection. Waves Course, 3.2: Spectra

1. Rainbows Share with a partner what you know about rainbows and a question you may have. Think about the following. What color is light from the Sun? Have you ever seen light from the Sun spread out as all the different colors in the sky? Do you know how rainbows form? Waves Course, 3.2: Spectra

1. Rainbows When the Sun’s light waves travel through air that has a lot of water drops in it, under some circumstances each tiny droplet can act like a tiny prism. A prism is a triangular piece of clear glass or plastic with special properties that let it show all the different colors of light that are present. The water droplets, acting like little prisms, spread out the colors in sunlight into a rainbow. A rainbow of colors can also be called a spectrum of colors. The plural of spectrum is spectra. Waves Course, 3.2: Spectra

Focus question 3.2 page 37 What do spectra reveal about light? Waves Course, 3.2: Spectra Step 1

3. Spectroscopes This tool can break light into colors, its called a spectroscope. At one end it has a slit opening where light can enter and at the other end is a piece of plastic with many, many tiny grooves in it. The plastic is called a diffraction grating, and it can spread light out into it colors much like a prism does. Waves Course, 3.2: Spectra

3. Spectroscopes When you get your spectroscope, hold the small end with the round hole (not the slit end) up to your eye and try looking through it at whatever light sources you find in this room. You should be able to see a slit on the left and a number scale on the right, with a band of light below the numbers. Waves Course, 3.2: Spectra

Spectra How would you describe the spectrum you see from light coming in from the skylights, sunlight? It looks like a rainbow What color in the spectrum appears at the lowest end of the number scale? Violet Waves Course, 3.2: Spectra Step 4

Spectra What color in the spectrum appears at the highest end of the number scale? Red What is the order of colors in the rainbow, starting at the low end of the scale? Violet, blue, green, yellow, orange, red. Waves Course, 3.2: Spectra Step 4

Spectra ROYGBIV Waves Course, 3.2: Spectra Step 1

Spectra drawing Draw each light source. Record a sketch of its spectrum in your notebook page 38, and label the light source. Waves Course, 3.2: Spectra Step 4

Spectra The spectrum for a light is like its signature. Each kind of light has a unique signature. The bright lines you see in a fluorescent light spectrum, especially the bright green can help you identify a fluorescent light. The spectrum is different from the sunlight spectrum. Waves Course, 3.2: Spectra

5. Analyze the scale The spectroscope has a scale in it for measuring wavelengths of light waves. The numbers on the scale indicate the wavelength of light along the different parts of the spectrum. The numbers 4, 5, 6, and 7 represent 400, 500, 600, and 700 nanometers, respectively. Waves Course, 3.2: Spectra Step 5

Analyze the scale What did you find for the longest wavelength of visible light? About 650-700 nm What did you find for the shortest wavelength of visible light? About 400-450 nm Light visible to humans is roughly 400-700 nm. Waves Course, 3.2: Spectra Step 5

Wrap-Up/Warm-Up What must happen for you to see an object? You have to see light from the object. It could be emitted (like a lightbulb or computer screen) or reflected (like a book, pen, or your hand) What happens when light reflects? Light waves bounce off a surface. The angle of reflection equals the angle of incidence. What kinds of surfaces reflect light? Nearly every single thing! If you can see it, and it is not a source of light, it must be reflecting light. Waves Course, 3.1: Mirrors Step 19

All rights reserved. Copyright The Regents of the University of California. Developed at Published and Distributed by Photo credits: Cover slide: © Sergey Nivens/Shutterstock Notebook image: © photastic/Shutterstock Waves Course, 3.2: Spectra