PHY1020 Final Exam Study Guide Chapter 8 1 An indication that light is a wave is that it has dark bands in the diffraction pattern 2 The colors of an oil slick indicate that light is a wave 3 The index of refraction measures the speed of light 4 Light waves are 5 The resolution of a human eye is about transverse 1 60 degree air increases 6 Which of the following has the lowest index of refraction 7 As the wavelength of light decreases the frequency 8 In one millionth of a second light will travel about 1000 feet 9 A piece of glass is shaped like a pyramis 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 in a directions that is tilted downward so it will eventually hit the ground 10 A stop sign is bright when you shine the headlamps of your car on it It most likely is covered with small glass spheres 11 Diamonds sparkle in many colors because light velocity depends on color 12 Which of the following are retroreflectors bicycle reflectors human eyes stop signs animal eyes 13 Two soap bubbles from the same soap appear different colors They probably have different thickness 14 If c is the speed of light in vacuum then the speed of light in glass is approximately 2 3 c 15 Stealth bombers are undetected by radar in part because of the absence of corner reflectors 16 Rainbows show different colors because in water different frequencies have different velocities 17 Which of the following is polarized blue sky light 18 A fiber can send much more information per second than a wire because light has a very high frequency 19 Which color of light would give the highest number of bits per second in fiber optics 20 Shannon is famous for having invented or discovered blue the bit light of the flash reflecting off the retina the black of the eye 21 The human eye has cones that detect 22 People squint to see better because squinting green blue red reduces the blur size 23 Old people need reading glasses because their lenses become less flexible 24 Red eye in photographs come from 25 Red eye demonstrates that the eye is a retroreflector 26 Your eye has two lenses the lens and the cornea 27 Light is polarized when it bounces off water glass air 28 Sunglasses can help you see a fish underwater because reflected light is polarized 29 Polaroids are used for 3 D movies because they give a different image to each eye 30 Stress in plastic can be detected by looking at polarized light crossed polaroids 31 In the pinhole camera more blurring occurs if the hole is either very large or very small 32 Holograms depend on the fact that light is a wave 33 A successful fisherman will throw the spear below the fish image 35 The wavelength of visible light is closet to the diameter of use a larger mirror a red blood cell 36 The Keck telescope is powerful because it has a bigger mirror to collect light 37 When we say a man is color blind we usually mean that he can t distinguish red from green 38 The Keck uses what to focus light a mirror 0 66 foot 34 To make a spy satellite that can read a license plate you would have to 39 Light in a vacuum goes 1 foot every nanosecond In water in one nanosecond it will go about 42 For a good telescope like Hubble in geosynchronous orbit HEO a typical resolution for objects on 40 Present day 3 D movies make use of which technology 41 A computer screen does not have spots that are colored polarizers white the surface is about 20 feet 43 A major use of fiber optics is for Communication Chapter 9 3 If you double the absolute temperature of an object the wavelength of the emitted light 1 Which of the following has the highest frequency 2 Which of the following has the lowest frequency gamma rays AM radio gets shorter by a factor of 2 4 Which kind of light has the longest wavelength infrared light 5 Invisible light includes x rays UV and IR red to yellow to white to blue 7 Radio waves and x rays have the 6 As an object gets hotter and hotter the color of its glow will change from 8 If you double the absolute temperature the total radiation same speed increases by 16 9 Most of the energy of an ordinary tungsten filament lightbulb is emitted in the color 11 A tungsten lightbulb has 100 watts printed on it About much power is actually emitted as visible 10 Heat radiation is also called light 12 Which color star would be the hottest 13 Sunlight is brightest in which color infrared IR 16 watts blue green 14 Which of the following exposes a person to the kind of radiation that can cause cancer computer aided tomography CAT scans 15 Because of their warmth humans emit primarily 16 If you sleep under a tree you won t get wet from morning dew That s because the tree infrared radiation emits infrared radiation 17 Dew forms when the ground cools 18 A heat seeking missile actually aims itself toward by emitting IR infrared light 19 The ozone layer is created by and absorbs choose all that are correct Ultraviolet radiation 20 Ozone depletion is caused by CFCs 21 A few years ago a certain kind of spray can was banned These were the cans that used chlorofluorocarbons CFCs 22 Multisprectral refers to the many colors in visible light 23 The name NMR has been changed to MRI 24 Which of the following about the ozone layer is not true Ozone is the most important greenhouse gas 25 The clouds in thunderstorms rise until they reach 26 The original name for the microwave oven was 27 Microwaves use radiation with a wavelength the ozone layer radar range same as radar 28 The microwaves in a microwave oven mostly heat 29 MRI maps the distribution of which element to produce an image water hydrogen 30 UV light choose all that are correct Is responsible for sunburns and windburns is used to kill bacteria in the water of remote villages in india and is also called black light 31 Which of the following is best for seeing the calcium in bones x ray 32 A black light is designed to emit UV 33 A positron is an antielectron 34 Sunburn is usually caused by UV radiation 35 Which of the following uses antimatter PET scan 36 To image the hydrogen in the body use MRI 37 Which is the cause for windburn 38 Remote control of a TV is usually done using 39 Pit vipers and mosquitoes can sense solar UV IR IR radiation 40 Infrared radiation can choose all that apply help snakes locate prey 41 Cancer is most likely to …
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