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