Exam 3 Physics Study Guide An indication that light is a wave is choose all that are appropriate 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 The resolution of the human eye is about 1 60th of a degree Which of the following has the lowest index of refraction Air As the wavelength of light decreases the frequency Increases In one millionth of a second light will travel caution possibly a trick question About 1000 feet 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 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 in diamond depends on color Which of the following are retro reflectors Bicycle reflectors human eyes stop signs and animal eyes Two soap bubbles from the same soap appear different colors They probably have Different thickness If c is the speed of light in vacuum then the speed of light in glass is approximately 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 having invented or discovered The bit The human eye has cones that detect Green blue red People squint I see better because squinting 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 retro reflector Your eye has Two lenses the lens and the cornea Light is polarized when it bounces off Water glass air Sunglasses can help you see a fish underwater because Reflected light is polarized Polaroid s 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 In the pinhole camera more blurring occurs if The hole is either very late 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 larger mirror The wavelength of visible light is closest to the diameter of a red blood cell Light in a vacuum goes 1 foot every nanosecond In water in one nanosecond it will go about 0 66 foot For a good telescope like Hubble in geosynchronous orbit HEO a typical resolution for objects on the surface of the Earth is 20 ft 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 Present day 3 D movies make use of which technology Polarizers A computer screen does not have spots that are colored White A major use of fiber optics is for Communication Which of the following has the highest frequency Ultraviolet Which of the following has the lowest frequency AM radio 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 Infrared light Invisible light includes X rays UV and IR As an object gets hotter and hotter the color of its glow will change from Red yellow white to blue Radio waves and x rays have the Same speed If you double the absolute temperature the total radiation Increases by 16 Most of the energy of an ordinary tungsten filament light bulb is emitted in the color Red Heat radiation is also called IR A tungsten light bulb has 100 watts printed on it About how much power is actually emitted as visible light 16 watts Which color star would be the hottest Blue Sunlight is brightest in which color Ultraviolet light Which of the following exposes a person to the kind of radiation that can cause cancer Choose all that apply 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 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 choose all that are correct CFCs A few years ago a certain kind of spray can was banned These were the cans that used Chlorofluorocarbons CFCs Multispectral refers to UV IR and visible 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 ozone layer The original name for the microwave oven was the 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 choose all that are correct Is responsible for sunburns and windburns is used to kill bacteria in the water of remote villages in India is also called black light and is also called heat radiation Which of the following is best for seeing calcium in bones X ray A black light is designed to emit UV A positron is An antielectron Sunburn is usually caused by UV radiation Which of the following uses antimatter PET scans To image the 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 mosquitoes can sense IR radiation Infrared radiation can choose all that apply Help snakes locate prey Cancer is most likely to be 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 1 000 000 eV
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