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Metals are both good heat and electrical conductors due to
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Physical Science
Homework 8
| Question | Answer |
|---|---|
| Metals are both good heat and electrical conductors due to | Looseness of outer electrons in metal atoms |
| A good heat conductor is a | Poor Insulator |
| Your toes feel warmer on a rug than on a tile floor because the rug | Is a better insulator than tile |
| If you were caught in freezing weather with only a candle for warmth, you would be warmer in | An igloo |
| A good insulator | Slows heat transfer |
| The process of convection occurs in | Fluids |
| If a volume of air is warmed, it expands. If a volume of air expands, it | Cools |
| Blow on your hand with your open mouth and you feel the warmth of your breath. Pucker your lips so your breath expands as you blow and your breath is | Cooler |
| Convection currents in the air near a seashore are produced by | Unequal heating of land and water |
| The average frequency of radiant energy is directly proportional to the | Kelvin temperature of the emitter |
| Objects that are good radiators generally | Absorb radiation relatively well |
| The higher the temperature of an object, the | Higher frequency it radiates |
| Which emits the highest frequency of radiation? | A blue-hot star |
| The higher the frequency of a wave, the | Shorter the wavelength |
| Cold water will warm to room temperature faster in a | Black Pot |
| An object will normally be a net radiator of energy when its temperature is | Higher than its surroundings |
| If air were a better conductor than it is, nighttimes on Earth would be | Noticeably cooler |
| A good absorber of radiation is a | Good emitter of radiation |
| A good reflector of radiation is a | Poor absorber of radiation |
| Suppose you want to save energy and you're going to leave your warm house for a half hour on a cold day. You should turn the thermostat | Off |
| The Sun's radiant energy is composed of shorter wavelengths than the Earth's because the Sun | Has a higher temperature than the Earth |
| Newton's law of cooling applies to objects that are | Warming and Cooling |
| A can of soft drink will cool faster if placed in what part of a refrigerator? | Freezer compartment |
| A red-hot piece of iron will cool faster in a | Cool room |
| If the greenhouse effect on Earth were absent, Earth's average temperature would be about | -18 degrees C |
| Glass and the atmosphere are largely transparent to | Visible Light |
| Glass in a florist's greenhouse blocks radiation of | Low frequency |
| The interior of a greenhouse emits long-wavelength radiation due to its | Temperature |
| The Earth loses heat mainly by | Radiation |
| When evaporation occurs in a dish of water, the molecules left behind in the water | Result in lowered temperature, are less energetic, and have decreased average speeds |
| Evaporation is a cooling process because | The more energetic molecules are able to escape the liquid. |
| Sublimation is a change of phase from solid to gas without | Going through the liquid phase |
| The dew that forms on a cold soda can when taken from a refrigerator is due to | Condensation |
| A hot dog pants | To help evaporation occur in its mouth and bronchial tract |
| Pigs wallow in mud mainly to | Cool themselves by evaporation |
| The process of boiling water tends to | Cool the water |
| Increased air pressure on the surface of hot water tends to | Prevent boiling |
| n the mountains, water boils at | A lower temperature than at sea level |
| When salt is introduced to water, the temperature at which freezing occurs is | Lowered |
| If you want to cook eggs by boiling them while in the mountains, then compared with cooking at sea level you should | Boil them for a longer period of time |
| Melting and freezing are | Opposite processes, changes of phase, and processes of molecular transfer. |
| Which would burn the most, 100 degrees of water or 100 degrees of steam? | Steam |
| When a gas is changed to a liquid phase, the gas | Releases energy |
| We are warmed by condensation because water molecules in the air striking our bodies | Transfer some of their kinetic energies to us |
Created by:
akozlowski