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PHY1020-Chapter 9
| Question | Answer |
|---|---|
| Which of the following has the highest frequency? ~Gamma rays ~UV ~IR ~Microwaves | Gamma rays |
| Which of the following has the lowest frequency? ~TV ~AM radio ~Visible light ~Gamma rays | AM Radio |
| If you double the absolute temperature of an object, the wavelength of emitted light: | GEts shorter by a factor of 16 |
| Which kind of light has the longest wavelength? ~Red light ~Blue light ~Infrared light ~Ultraviolet light | 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, 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: | Red. |
| Heat radiation is also called: | IR |
| A tungsten lightbulb has 100 watts printed on it. About how much power is emitted as visible light? | 16 watts |
| Which color star would be the hottest ~Blue ~Red ~Orange ~White | Blue |
| Sunlight is brightest in which color? | IR |
| Which of the following exposes people to the kind of radiation that can cause cancer?: ~computer-aided tomography (CAT) scans ~magnetic resonance imaging (MRI) ~Positron-emission tomography (PET) ~thermography | Computer-aided tomography (CAT) scans |
| Because of their warmth, humans primarily emit: | 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: | 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 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: | 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 ~Is used to kill bacteria in the water of remote villages in India ~Is also called black light |
| Which of the following is the 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? ~CAT scan ~MRI ~PET scan ~x-ray | PET scan |
| To image 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 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 caves by using | Ultrasound. |
| The phosphor of a fluorescent lightbulb turns which of these into visble 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? ~Radar ~Visible Light ~UV ~X-rays | ~Visible Light ~UV ~X-rays |
| To image hydrogen in the brain, the best technique: | MRI |
| Which of the following is an advanced methos that uses x-rays? | CAT |
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