PHY1020 Duke Final Exam Study Guide Chapter 8 9 10 FSU SPRING 2014 Chapter 8 The colors of an oil slick indicate that o Light is a wave An indication that light is a wave is choose all that are appropriate o That is has dark bands in the diffraction pattern o That it passes through glass o That is reflects off surfaces o Its high speed ALL of these The index of refraction measures o The speed of light Light waves are o Transverse The resolution of a human eye is about Which of the following has the lowest index of refraction As the wavelength of light decreases the frequency o 1 60 degree o Air o Increases o About 1000 feet In one millionth of a second light will travel caution possibly a trick question A piece of glass is shaped like a pyramid The side of the pyramid is tilted at 45 degrees with respect to the horizontal A beam of light is inside the glass moving horizontally When it emerges from the tilted surface of the glass it will be moving o In a direction that is tilted downward so it will eventually hit the ground A stop sign is bright when you shine the headlamps of your car on it It most likely is covered with o Small glass spheres Diamonds sparkle in many colors because o The velocity depends on color Which of the following are retroreflectors Choose all that apply o Bicycle reflectors human eyes stop signs animal eyes choose all of the above Two soap bubbles from the same soap appear to be different colors They probably have If c is the speed of light in vacuum then the speed of light in glass is approximately o Different thickness o 2 3 c Stealth bombers are undetected by radar in part because o Of the absence of corner reflectors Rainbows show different colors because o In water different frequencies have different velocities Which of the following is polarized o Blue sky light A fiber can send much more information per second than a wire because o Light has a very high frequency Which color of light would give the highest number of bits per second in fiber optics Shannon is famous for having invented or discovered among other things o Blue o The bit The human eye has cones that detect o Green Blue Red Memory trick Ready to Get Blasted People squint to see better because squinting o Reduces the blur size Old people need reading glasses because their o Lenses become less flexible Everything becomes less flexible when you age Red eye in photographs comes from o Light of the flash reflecting off the retina the back of the eye Remember the last part or at least Red eye Reflects Retina Red eye demonstrates that o The eye is a retroreflector Your eye has o Two lenses the lens and the cornea Light is polarized when it bounces off choose all that are correct o Water glass air choose all of them Sunglasses can help you see a fish underwater because o Reflected light is polarized Polaroids are used for 3 D movies because o They give a different image to each eye Stress in plastic can be detected by looking at o Polarized light crossed polaroids In the pinhole camera more blurring occurs if o The whole is either very large or very small Holograms depend on the fact that light o Is a wave A successful fishman will throw the spear o Below the fish image Fish get low low low This is probably the only useful thing to learn in the class in case you are ever in a man v wild scenario in your life To make a spy satellite that can read a license plate you would have to The wavelength of visible light is closest to the diameter of o Use a larger mirror o A red blood cell The Keck telescope is powerful because o It has a bigger mirror to collect light When we say a man is color blind we usually mean that o He cannot distinguish red from green Xmas colors The Keck uses what to focus light o A mirror Light in a vacuum goes 1 foot every nanosecond billionth of a second In water in one nanosecond it will go about Present day 3 D movies make use of which technology A computer screen does not have spots that are colored o 0 66 foot o Polarizers o White For a good telescope like Hubble in geosynchronous orbit HEO a typical resolution for objects on the surface is about o 20 feet A major use of fiber optics is for o Communication Is this really a college class CHAPTER 9 Which of the following has the highest frequency Which of the following has the lowest frequency o Gamma Rays o AM radio o Gets shorter by a factor of 2 Which kind of light has the longest wavelength o Infrared light If you double the absolute temperature of an object the wavelength of the emitted light Can keep you warm I guess a long wavelength would do that well when compared to a shorter one eh Invisible light includes o X ray UV IR We hardly talked about the words within the other answer choices so just know that it s the usual As an object gets hotter and hotter the color of its glow will change from o Red to Yellow to White to Blue Basically red white and blue except yellow is thrown in there none of the other answer choices will display red white and blue in that order Radio waves and X rays have the o Same speed If you double the absolute temperature the total radiation o Increases by 16 Just memorize the fact that we are talking about radiation and when temp increases radiation will by a significantly large amount AKA 16 Most of the energy of an ordinary tungsten filament lightbulb is emitted in the color o Infrared didn t know infrared was a color maybe if we all read or attended class it would be more obvious A tungsten light bulb has 100 watts printed on it About how much power is actually emitted as Heat radiation is also called o IR visible light o 16 watts Sweet 16 again Which color star would be hottest o Blue Sunlight is brightest in which color o Green Light up your green Movie stars with blue eyes are hottest Which of the following exposes a person to the kind of radiation that can cause cancer choose all that apply o Computer aided tomography CAT scans Don t let medical professionals give you these for BS reasons like when you are just there faking a headache for a work excuse note Because of their warmth humans emit primarily o Infrared radiation If you sleep under a tree you won t get wet from morning dew That s because the tree o Emits infrared radiation I knew all living things were connected somehow Dew forms when the ground cools A heat seeking missile actually …
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