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Phy1020
| Question | Answer |
|---|---|
| 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 |
| the resolution of a human eye is about | 1/60 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 | about 1,000 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 | in a directions 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 | bicycle reflectors, human eyes, stop signs, 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 to 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 black 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 | 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 | is a wave |
| A successful fisherman will throw the 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 closet to the diameter of | a red blood cell |
| 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 cant distinguish red from green |
| the keck uses what to focus light | a mirror |
| Light in a vacuum goes 1 foot every nanosecond. In water,in one nanosecond it will go about | .66 foot |
| Present-day 3-D movies make use of which technology | polarizers |
| A computer screen does not have spots that are colored | white |
| For a good telescope (like Hubble) in geosynchronous orbit (HEO), a typical resolution (for objects on the surface) is about | 20 feet |
| A major use of fiber optics is for | communication |
| Which of the following has the highest frequency | gamma rays |
| 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 | infared 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, to yellow, to 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 lightbulb is emitted in the color | infrared |
| Heat radiation is also called | IR |
| A tungsten lightbulb has 100 watts printed on it. About much power is actually emitted as visible light | 16 watts |
| Which color star would be the hottest | blue |
| Sunlight is brightest in which color | green |
| 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 | by emitting IR |
| A "heat-seeking" missile actually aims itself toward | infrared light |
| The ozone layer is created by and absorbs (choose all that are correct) | 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) |
| Multisprectral refers to | the many colors in visible light |
| The name NMR has been changed to | MRI |
| Which of the following 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 |
| Microwaves 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 the correct answers) | 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 |
| 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 | an antielectron |
| Sunburn is usually caused by | UV radiation |
| Which of the following uses antimatter | PET scan |
| To image the hydrogen in the body, use | MRI |
| Which 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 | 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 | measurement of wave velocities in the ocean |
| Bats navigate in cave by using | ultrasound |
| The phosphor of a fluorescent lightbulb turns which if these into visible light | ultravoilet light |
| "Cool roofs" | must reflect infrared |
| The best kind of radiation to purify water is | UV |
| Which of the following are electromagnetic waves (choose all that are appropriate) | Radar, visible light, UV, x-rays |
| To image hydrogen in the brain, the best technique is | MRI |
| Which of the following is an advanced method that uses x-rays | CAT |
| Higher carbon dioxide levels than we have now were last seen about | 2 million years ago |
| The country that produces the most carbon dioxide each year is | China |
| The country that produces the most carbon dioxide per person every year is | Saudi Arabia |
| The greenhouse effect currently warms the Earth by approximately | 35 degrees f |
| Which fossil produces the most CO (subscript 2),per pound, when burned | coal |
| Converting coal to oil is achieved with | Fisher-Tropsch |
| Carbon dioxide in the atmosphere has increased over the past 100 years by | 36 percent |
| Ice in Antarctica is | increasing, contradicting global warming predictions |
| A treaty that was signed by the United States but not ratified by the Senate is | Kyoto |
| According to the text, windpower is | rapidly growing,with wind turbines delivering twice the power they did four years ago |
| Clean Coal | refers to coal used at a power plant with carbon capture and storage (CCS) |
| In France, nuclear power produces what percentage of the electricity | 80 percent |
| In the United States, nuclear power produces what percentage of the electricity | 20 percent |
| The organization that studies climate change is | IPCC |
| Which of these years had the warmest climate | 2005 |
| If the Unites States reduce CO (subscript 2) emissions to those suggested by the Kyoto treaty, and the developing nations continued to increase theirs at the current (allowed) rate, then global warming would be delayed by about | 3 years |
| The greenhouse effect involves atmospheric emission of | IR |
| To be affordable without subsidy or carbon credits, the cost of a billion-watt solar plant must not be much more than | $1 billion |
| The average temperature of the Earth is now about | 57 degrees |
| Which country produces the most greenhouse gas emission per GDP | USA |
| A key feature of the Kyoto treaty is that it | set up a method to trade carbon credits |
| Cooling in the last big ice age, which ended about 12,000 BC, was approximately | 11 degrees |
| Cooling during the Little Ice Age was approximately | 2 degrees |
| Which of the following is not a major greenhouse gas | CFCs such as Freon |
| The least expensive form of carbon abatement is | conservation |
| Thanks to humans, the carbon dioxide in the atmosphere has | increased by about 36 percent |
Created by:
dkaufman92
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