Phys Chp 7
Water boils in the mountains at a lower temperature than at sea level. a higher temperature than at sea level. the same temperature as at sea level.
a lower temperature than at sea level
When a solid is changed to a liquid phase, the solid absorbs energy. releases energy. neither of these none of the above
absorbs energy
Radiant energy emitted by our planet is the outcome of radioactivity in Earth's interior. terrestrial energy. electromagnetic. all of the above
all of the above
The process of convection occurs in fluids liquids. solids. gases. none of the above
fluids
The number of grams of ice that can be melted by 1 g of 100°C steam is 0.125 g. 6.75 g. 8 g. 0.148 g. none of the above
8g
Which emits radiation of the highest frequency? the Sun a red-hot star a blue-hot star all the same
a blue-hot star
Glass in a florist's greenhouse acts as a one-way valve by being transparent only to lower-frequency waves. blocking unwanted radiation. blocking the flow of light energy. allowing high-frequency waves to enter and blocking low-frequency waves from exiting.
allowing high-frequency waves to enter and blocking low-frequency waves from exiting
If you were caught in freezing weather with only a candle for warmth, you would be warmer in an igloo. a wooden house. a tent.
an igloo
A soda can with a small amount of water is on a hot stove. Soon steam comes from its opening. When the can is quickly inverted into a pan of water, the can is crushed by a drop in temperature. atmospheric pressure condensation. suction of the can interior.
atmospheric pressure
Cold water will warm to room temperature faster in a silver pot. black pot. depends on size, not color
black pot
When boiling your breakfast eggs while in the mountains, to compensate for altitude you should boil the eggs for a longer time. use a hotter flame. boil the eggs for a shorter time. none of the above
boil the eggs for a longer time
Warm air rises because faster moving molecules tend to move to regions of less density. pressure. both of these none of the above
both of these
What normally occurs in a saucer of water placed on your table is condensation. evaporation. both of these none of the above
both of these
Conduction has most to do with electrons and atoms radiating energy. changing identities. flowing past one another. bumping into one another.
bumping into one another
In a muggy region, the extra warmth you often feel is mainly due to evaporation. condensation. sublimation. none of the above
condensation
The dew that forms on a cold soda can when taken from a refrigerator is due to evaporation. condensation. sublimation. none of the above
condensation
The atmosphere becomes opaque to infrared radiation when it contains excess water vapor and carbon dioxide. radiates high-frequency radiation. increases in temperature. none of the above
contains excess water vapor and carbon dioxide
Melting snow tends to cool the surrounding air. warm the surrounding air. neither of these
cool the surrounding air
If a volume of air is warmed, it expands. If a volume of air expands, it cools. warms. neither of these
cools
Radiant energy from the Sun is composed of shorter wavelengths than radiation from the Earth because the Sun has a higher temperature than the earth has much more thermal energy. is an energy source while the Earth is primarily an energy receiver. none of the above
has a higher temperature than the earth
The higher the temperature of an object, the lower the frequency of emitted radiation. higher the frequency of emitted radiation. longer the wavelength of emitted radiation. none of the above
higher the frequency of emitted radiation
When air is compressed, its temperature increases. decreases. neither of these
increases
The average frequency of radiant energy is directly proportional to the kelvin temperature of the emitter. Celsius temperature of the emitter. Fahrenheit temperature of the emitter. all of the above none of the above
kelvin temperature of the emitter
When bringing water to a boil in the mountains, the time needed to reach the boiling point is less than at sea level. more than at sea level. the same as at sea level.
less than at sea level
Metals are both good heat and electrical conductors due to similar thermal and electrical conductive properties. relatively high densities of metals. looseness of outer electrons in metal atoms. ability of metals to transfer energy easily. high elasticity of metals.
looseness of outer electrons in metal atoms.
Glass in a florist's greenhouse blocks radiation of relatively all frequencies. high frequencies. low frequencies.
low frequencies
A blueberry pie will be a net absorber of energy when its temperature is higher than its surroundings. lower than its surroundings. none of these
lower than its surroundings
When salt is introduced to water, the temperature at which freezing occurs is lowered. quite unaffected. increased. dependent on the shape of salt and ice crystals
lowered
If an object absorbs more energy than it emits, its thermal energy decreases. temperature decreases. both of these none of the above
none of the above
To melt 50 g of 0°C ice requires 80 calories. 25 calories. 50 calories. none of the above
none of the above
Which of these are good conductors? feathers snow wood all the above none of the above
none of the above
When you leave your warm house for an hour or so on a cold day, to save energy you should turn the thermostat up. off. to room temperature. down.
off
Sublimation is a change of phase from solid to gas without a transfer of energy. passing through the liquid phase. a change of temperature.
passing through the liquid phase
In one word, account for water temperature exceeding 100°C in the power plant of a nuclear submarine. condensation evaporation vaporization conductivity pressure
pressure
An infrared thermometer operates by way of conduction, convection, and radiation. temperature differences. radiant energy invisible to humans none of the above
radiant energy invisible to humans
A substance most commonly emits heat energy by the process of radiation. convection. conduction. none of the above
radiation
The planet Earth loses heat primarily by radiation. convection. conduction. all of the above none of the above
radiation
As water changes to ice, water molecules release energy. lose the quality of wetness. retain their energy. absorb energy.
release energy
When a gas is changed to a liquid phase, the gas releases energy. absorbs energy. neither of these
release energy
The higher the frequency of a wave, the shorter the wavelength. longer the wavelength. neither of these
shorter the wavelength
The higher the temperature of an object, the longer the wavelengths it radiates. shorter the wavelengths it radiates. none of the above
shorter the wavelengths it radiates
It is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. Knowledge of Newton's law of cooling is unrelated to this. supports this. contradicts this.
supports this
Evaporation is a cooling process because the more energetic molecules escape the liquid. heat is radiated during the process. of conduction and convection. none of the above
the more energetic molecules escape the liquid
Convection currents in the air near a seashore are produced by unequal heating of land and water. varying temperatures. shifting winds. none of the above
unequal heating of land and water
Which is not a phase of matter? vacuum solids gases liquids
vacuum
The molecules in a room-temperature glass of water jostle around at constant speeds. various speeds. much the same speed.
various speeds
A red-hot piece of iron will cool slower in a warm room. cold room. same in each
warm room
When snow forms in clouds, the surrounding air is cooled. warmed. both of these none of the above
warmed
As a block of ice at 0°C melts, the block absorbs energy without a temperature change. and increases in temperature. and decreases in temperature. all of the above none of the above
without a temperature change
A block of wood and a block of copper will feel neither hot nor cold to your touch when they each have equal conductivities. your temperature. equal temperatures. none of the above
your temperature