Light - Oh I see. 3. I know that sound needs a medium. Does light need a medium? Give me proof.

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1 Light & Color Honor Phyic 2014/15 Name Light - Oh I ee 1. When we talked about echoe, we learned that an echo i a ound wave bouncing off omething. Since light i a wave a well, why don t we ee light echoe? 2 I a light year ditance or time? 3. I know that ound need a medium. Doe light need a medium? Give me proof. 4. I light a tranvere or longitudinal wave? 5. Other than the viible light (that we ee) are there any other wave zipping around u? 6. Where do thee electromagnetic wave come from? 7. On the electromagnetic pectrum, which wave would poe the greatet threat to our health? WHY? 8. Which electromagnetic wave travel the fatet? 9. Which electromagnetic wave ha the longet wavelength? 10. How much of the electromagnetic pectrum i made up of light we can ee (viible light)? 11. What are ome of the ue of the different electromagnetic wave? 12. What doe it mean to ay omething i tranparent? What doe opaque mean? 13. I know gla i tranparent to viible light. I gla tranparent to the whole electromagnetic pectrum? 14. What caue the gla to not tranmit (be tranparent to) an electromagnetic wave? Page 1 of 15

2 Light & Color Honor Phyic 2012/13 Electromagnetic Spectrum Page 2 of 15

3 Light & Color Honor Phyic 2012/13 Light and an introduction to color 1. What color do you ee when you look at the fluorecent light in the ceiling? What color do you ee when you look at the ame light through a pectrocope? 2. Ue the pectra cope and examine the color of the light emitted by the un. What color do you ee? Lit the color of the rainbow in order of lowet to highet energy 3. What color do you ee when looking at the following light ource: a. Hydrogen b. Helium c. Air d. Neon 4. How i color produced from thee different gae? 5. What i different about the gae in quetion 3 that make you ee different et of color? 6. How can cientit ue thi information to determine what tar are made of? Page 3 of 15

4 Light & Color Honor Phyic 2012/13 7. What make light in a regular light bulb? 8. Why are fluorecent light bright and more efficient? 9. What color of light would you ee from the un if you were in pace? 10. Why i the ky blue? 11. What color i the un a een from earth? Why? 12. What two tructure in our eye detect light? a. Which if thee are ued to detect black and white? b. Which of thee i ued to detect color? c. What color do they detect? 13. Why do green houe heat up? Page 4 of 15

5 Light & Color Honor Phyic 2012/13 Mixing Light = Color Addition 1. The diagram below depict the primary and econdary color of light. Primary color are hown where there are no overlapping circle. Thee color correpond to the cone in our eye. The three primary color are: 2. The econdary color are where two circle overlap. The econdary color are the addition of two primary color. Red + Green = Red + Blue = Blue + Green = Label the econdary color on the diagram. Mixing pigment = Color Subtraction 1. The econdary color of light make up the primary color of pigment. Mix the following combination of clay to determine what happen when pigment are mixed. Cyan + Magenta = Cyan + Yellow = Yellow + Magenta = 2. Uing one of the example above, how how color i ubtracted to leave the final color. Filter 1. A filter it own color while all other color are. Show example here Page 5 of 15

6 Light & Color Honor Phyic 2012/13 Light Demontration 1. The ketch how the hadow of a hand held in front of a white creen in a darkened room. The light ource i red, o the creen look red and the hadow look black. Color the ketch with colored marker, or mark in the color with pen or pencil. 2. A green lamp i turned on and make a econd hadow. The formerly black hadow cat by the red light i no longer black, but i illuminated with green light. So it i green. Color or mark it green. The hadow cat by the green lamp i not black, becaue it i illuminated with the red light. Color or mark it color. Color or mark the background, which receive a mixture of red and green light. GREEN 3. A blue lamp i turned on, and three hadow of the hand appear. Color or mark the appropriate color of the hadow and the background. Page 6 of 15

7 Light & Color Honor Phyic 2014/15 Name Color Workheet RED GREEN BLUE Fill in the blank. (Some may require more than one color!) 1. Red light + blue light = 2. White light - red light = 3. White light - blue light = 4. Green light + blue light = 5. Green light + blue light + red light = 6. Magenta light + cyan light = 7. Magenta light + green light = 8. Yellow paint aborb light. 9. A magenta filter aborb light. 10. A cyan filter allow light to pa through it. 11. A piece of cyan paper illuminated with red light will look 12. A piece of magenta paper illuminated with red light will look 13. A piece of blue paper illuminated with red light will look 14. A piece of blue paper illuminated with yellow light will look 15. A cyan filter placed over a magenta filter will allow light to pa through it. 16. A red filter placed over a magenta filter will allow light to pa through it. 17. A red filter placed over a cyan filter will allow light to pa through it. 18. In order to get a true green color, an artit would mix paint. 19. In order to get a true red color, an artit would mix paint. 20. Magenta paint mixed with yellow and cyan paint produce. Page 7 of 15

8 Light & Color Honor Phyic 2014/15 Name Color Phun The following ymbol indicate the color of an object in white light. red blue green yellow magenta cyan white black 1. Write the color each of the following object would appear in green light on the line below the object. 2. Write the color each of the following object would appear in magenta light on the line below the object. 3. Write the color each of the following object would appear in yellow light on the line below the object. 4. Write the color each of the following object would appear in blue light on the line below the object. 5. If you were jealou of your friend' dazzling new red weater, how could you make it turn black at the dinner table by changing the light bulb? In other word, what color would the light bulb need to be? Explain your anwer. Page 8 of 15

9 Light & Color Honor Phyic 2012/13 Pigment -Mixing Paint & Printing Color by ubtraction of light Pigment imply aborb certain frequencie and reflect other. Whichever color the pigment reflect the mot will be the color that the pigment appear. For example blue pigment reflect motly blue, but alo reflect violet and green while aborbing all other color. A yellow pigment reflect motly yellow, but alo reflect red, orange, and green. If you combine thee two pigment only green i reflected by both o green i the color produced. Thi proce i called ubtractive color mixing (note the difference between additive and ubtractive). Primary color for ubtractive color mixing are magenta, cyan, and yellow. Why? (figure thi out for yourelf) Thee color (plu black) are ued in printing illutration in full color. Each color page i printed four time in ucceion - firt with cyan, econd yellow, third magenta, and latly black. Every color can be made by combining thee color. RED ORANGE YELLOW GREEN BLUE VIOLET Blue R O Y G B V GREEN BLUE VIOLET R O Y G B V GREEN Yellow RED ORANGE YELLOW GREEN Blue Mixed with yellow Green Page 9 of 15

10 Light & Color Honor Phyic 2014/15 Name Radiation Curve 1. Draw the radiation curve (frequency v. brightne) for each of the different light ource and label where each peak. SUNLIGHT B r i g h t n e R O Y G B I V Frequency INCANDESCENT LIGHTS FLUORESCENT LIGHTS BLACK LIGHT Page 10 of 15 B r i g h t n e B r i g h t n e B r i g h t n e R O Y G B I V Frequency R O Y G B I V Frequency R O Y G B I V Frequency

11 Light & Color Honor Phyic 2012/13 2. Why do clothe ometime eem like they match in a department tore but not when you go outide? 3. Draw the cone enitivity for human eye on the diagram. HUMAN EYES B r i g h t n e R O Y G B I V Frequency 4. How doe the enitivity of the different cone compare to the brightne of unlight? Why? Why are ome fire truck painted a yellowih green color? Note: 1. Why are fire truck painted a yellowih green color? 2. Tenni ball ued to be white. What advantage i there to making tenni ball yellowgreen? 3. Many road ign are being repainted. What advantage i there to having yellow-green road ign? 4. What color() are our eye mot enitive to? Why? Page 11 of 15

12 Light & Color Honor Phyic 2014/15 Name 1. Ray diagram for a flat mirror: Mirror 2. The mirror A in the diagram below i a mirror. The light converge to what point? Mirror B i a mirror and diverge light in what direction? 3. Uing the diagram below, draw a ray diagram for the convex mirror. a) The image formed by thi mirror i alway: and b) Example of thi type of mirror include: Page 12 of 15

13 Light & Color Honor Phyic 2012/13 4. Draw a ray diagram for a concave mirror with an object outide the focal point. The image for thi location i and 5. Draw a ray diagram for a concave mirror with an object inide the focal point. The image for thi location i and Summary: A concave mirror i curved while a convex mirror i curved If an image i upright then it mut be In a concave mirror, the image i and outide the focal point and witche to and inide the focal point. Page 13 of 15

14 Light & Color Honor Phyic 2014/15 Name LIGHT REVIEW SHEET Anwer the following in two or more full, thoughtful entence? 1a. What i the ource of all electromagnetic wave? b. How fat do light, radio wave, microwave, etc. travel in a vacuum? 3a. Write the electromagnetic pectrum in order of increaing energy. b. in order of increaing wavelength. c. in order of increaing frequency. 4. Why doe light travel fater through a vacuum than through a medium? 5. What happen to variou part of the electromagnetic pectrum when they trike gla? Give example. 6. What doe the word tranparent mean? What doe opaque mean? 7. What i the difference between polarized and unpolarized light? How can you tell if light i polarized? 8. Define both black and white. 9. What are the primary color of light? Page 14 of 15

15 Light & Color Honor Phyic 2012/ Define and give example of complementary color. 11. Ditinguih between color mixing by addition and color mixing by ubtraction? 12. Why i the ky blue during the day but red at unet and unrie? 13. Why i water cyan? Why do lobter look black from above water? 14. How do you know what element are in the un and what intrument are ued to determine thi? 15. What color would the following object appear in each color light? color in white light red green magenta cyan yellow color in blue light color in cyan light color in yellow light Page 15 of 15