PHY1020 Exam 3 An indication that light is a wave is that it has dark bands in the diffraction pattern The colors of an oil slick indicate that light is a wave The index of refraction measures the speed of light Light waves are transverse 1 60 degree air increases about 1000 feet The resolution of the human eye is about Which of the following has the lowest index of refraction As the wavelength of light decreases the frequency In one millionth of a second light will travel A piece of glass is shaped like a pyramid The side of the pyramid is titles 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 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 small glass spheres Diamonds sparkle in many colors because light velocity depends on color Which of the following are retroreflectors all bicycle reflectors human eyes stop signs animal eyes 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 different thickness 2 3 c Stealth bombers are undetected by radar in part because of the absence of corner reflectors Rainbows show different colors because in water different frequencies have different velocities Which of the following is polarized blue sky light A fiber can send much more information per second than a wire because 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 blue the bit The human eye has cones that detect People squint to see better because squinting green blue red reduces the blur size Old people need reading glasses because their lenses become less flexible Red eye in photographs comes from light of the flash reflecting off the retina the back of the eye Red eye demonstrates that the eye is a retroreflector Your eye has two lenses the lens and the cornea Light is polarized when it bounces off all water glass air Sunglasses can help you see a fish underwater because reflected light is polarized Polaroids are used for 3 D movies because they give a different image to each eye Stress in plastic can be detected by looking at polarized light crossed polaroids In the pinhole camera more blurring occurs if the hole is either very large or very small Holograms depend on the fact that light A successful fisherman will throw the spear To make a spy satellite that can read a license plate you would have to is a wave below the fish image use a larger mirror a red blood cell The wavelength of visible light is closest to the diameter of The Keck telescope is powerful because it has a bigger mirror to collect light When we say a man is color blind we usually mean that he can t distinguish red from green The Keck uses what to focus light a mirror 0 66 foot polarizers white 20 feet 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 For a good telescope like Hubble in geosynchronous orbit HEO a typical resolution for objects on the surface is about A major use of fiber optics is for communication Chapter 9 gamma rays AM radio Which of the following has the highest frequency Which of the following has the lowest frequency If you double the absolute temperature of an object the wavelength of the emitted light gets shorter by a factor of 2 Which kind of light has the longest wavelength As an object gets hotter and hotter the color of its glow will change from infrared light Invisible light includes x rays UV and IR red to yellow to white to blue Radio waves and x rays have the same speed increases by 16 infrared Heat radiation is also called If you double the absolute temperature the total radiation Most of the energy of an ordinary tungsten filament lightbulb is emitted in the color A tungsten lightbulb has 100 watts printed on it About how much power is actually emitted as visible light IR 16 watts blue green Which color star would be the hottest Sunlight is brightest in which color Which of the following exposes a person to the kind of radiation that can cause cancer computer aided tomography CAT scans Because of their warmth humans emit primarily infrared radiation If you sleep under a tree you won t get wet from morning dew That s because the tree emits infrared radiation Dew forms when the ground cools A heat seeking missile actually aims itself towards by emitting IR infrared light The ozone layer is created by and absorbs ultraviolet radiation Ozone depletion is caused by CFCs A few years ago a certain kind of spray can was banned These were the cans that used chlorofluorocarbons CFCs Multispectral refers to the many colors in visible light The name NMR has been changed to MRI Which of the following statements about the ozone layer is not true ozone is the most important greenhouse gas The clouds in thunderstorms rise until they reach The original name for the microwave oven was Microwave ovens use radiation with a wavelength The microwaves in a microwave oven mostly heat the ozone layer radar range same as radar water MRI maps the distribution of which element to produce an image hydrogen UV light is NOT also called heat radiation x ray Which of the following is best for seeing calcium in bones A black light is designed to emit Sunburn is usually caused by Which of the following uses antimatter To image the hydrogen in the body use What is the cause for windburn UV A positron is an antielectron UV radiation PET scan MRI solar UV IR Pit vipers and mosquitoes can sense IR radiation Infrared radiation can help snake locate prey Cancer is most likely to be caused by ultraviolet radiation emits visible light Remote control of a TV is usually done using The advertising slogan whiter than white means that the material To make clothes appear extra clean manufacturers apply Which of the following is a typical energy for an x ray In total darkness you can see people of you have a camera that is sensitive to Each of these make use of infrared radiation except measurements of wave velocities in the ocean Bats navigate in caves by using The phosphor
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