Chapter 8 An indication that light is a wave is that is has dark bands in the diffraction pattern The colors of an oil slick indicate that light is a wave The index of refraction measures speed of light Light waves are transverse The resolution of the human eye is 1 60 degree Has the lowest index of refraction air Wavelength of light decreases the frequency increases One millionth of a second light will travel 1000 feet A piece of glass is shaped like a pyramid 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 is covered with small glass spheres Diamonds sparkle in many colors because light velocity depends on color Which of the following are retroreflectors all the above Two soap bubbles from the same soap appear to be different colors They probably have different thickness If c is the sped of light in vacuum then the speed of light in glass is apporx 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 blue Shannon is famous for the bit Human eye has cones that can detect green blue red People squint to see better because squinting reduces the blue 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 back of the eye Red eye demonstrates the eye is a retroreflector Your eye has two lenses and the cornea Light is polarized when it bounces off water glass air all the above Sunglasses can help you see a fish underwater because a reflected light is polarized Polaroid s are used for 3D movies because they give a different image to each eye Stress in plastic can be detected by looking at polarized light In the pinhole camera more blurring occurs if the hole is either very large or very small Holograms depend on the fact that light is a wave A successful fisherman will throw a spear below the fish image To make a spy satellite that can read a license plate you would have to use a large mirror The wavelength of visible light closest to the diameter of a red blood cell The Keck telescope is powerful because it has bigger mirror to collect light When we say a man is color blind that usually means he can t distinguish red from green The Keck uses what to focus light a mirror Light in a vacuum goes 1 foot every nanosecond In water one nanosecond it will go about 66 foot Present day 3D movies make use of what technology polarizers A computer screen does not have spots that are colored what color white For a good telescope in geosynchronous orbit a typical resolution is about 300 feet A Major use of fiber optics for communication Chapter 9 Which has the highest frequency gamma rays Which of the following has the lowest frequency AM radio If you double the absolute temp of an object the wavelength if the emitted light gets shorter by a factor of 2 Which kind of light has the longest wave length infrared light Invisible light includes x rays UV IR As an object gets hotter and hotter the color of its glow will change from red to yellow to white to blue Radio waves and x rays have the same speed If you double the absolute temp the total radiation increases by 16 Most energy of an ordinary tungsten filament lightbulb is emitted in the color infrared Heat radiation is also called IR A tungsten lightbulb has 100 watts printed on it About how much power is actually emitted as visible light 16 watts Which color would a star be the hottest blue Sunlight is brightest in which color green Which exposes a person to the kind of radiation that can cause cancer computer aided CAT scans Because of their warmth humans emit primarily infrared radiation If you sleep under a tree you wont get wet from morning dew Thats because the tree emits infrared radiation Dew forms when the ground cools by emitting IR A heat seeking missile actually aims itself toward 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 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 statement about the ozone layer is not true Ozone is the most important greenhouse gas The clouds in thunderstorms rise until they reach the ozone layer The original name for the microwave oven was radar range Microwave ovens use radiation with a wavelength same as radar The microwaves in a microwave oven mostly heat water MRI maps the distribution of which element to produce an image hydrogen UV light is responsible for sunburns and windburns Which of the following is best for seeing the calcium in bones x ray A black light is designed to emit UV A positron is the same as an electron Sunburn is caused by UV radiation Which of the following uses anti matter PET scan To image to hydrogen in the body use MRI What is the cause for windburn Solar UV Remote control of a TV is usually done using IR Pit vipers and mosquitos can sense IR radiation Infrared radiation can help snakes locate prey Cancer is most likely caused by ultraviolet radiation The advertising slogan whiter than white means that the material emits visible light To make clothes appear extra clean manufacturers apply fluorescent dyes Which of the following is a typical energy for an x ray 50 000 eV In total darkness you can see people if you have a camera that is sensitive to infrared radiation Cell phones emit microwaves Each of these make use of infrared radiation except measurements of wave velocities in the ocean Bats navigate in caves by using ultrasound The phosphor of a fluorescent lightbulb tuns which of these into visible light ultraviolet light Cool Roofs must reflect infrared The best kind of radiation to purify water is UV Which of the following are electromagnetic waves all the above To image hydrogen in the brain the best technique is MRI Which of the following is an advanced method that uses X rays CAT Chapter 10 Higher carbon
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