Ch 16 Heat Transfer
The solar constant for Earth is a. 1.0 kW/m^2 b. more than 1.4 kW/m^2 c. 1.4 kW/m^2 d. 0.7 kW/m^2
1.4 kW/m^2
The amount of solar energy per square meter atop the atmosphere at right angles to the Sun's rays is about a. 1400 joules b. much more than 1400 joules c. 1000 joules d. 700 joules
1400 joules
Long ago a runaway greenhouse effect transformed the planet a. Mars b. Mercury c. Venus d. all of the above
Venus
If there were no greenhouse effect, Earth's average temperature would likely be a. near absolute zero b. a frigid -18 degrees C c. warmer than now d. comfortably cooler
a frigid -18 degrees C
The temperature of outer space is a. zero b. meaningless c. about 2.7 Kelvin d. none of the above
about 2.7 Kelvin
Objects that radiate relatively well a. reflect radiation relatively well b. absorb radiation relatively well c. both of these d. neither of these
absorb radiation relatively well
The pupil of your eye is a net a. reflector of radiator energy b. emitter of radiant energy c. absorber of radiant energy d. none of above
absorber of radiant energy
A bare roof on a warmly heated home on a snowy day indicates a. fairly good conductivity b. poor insulation c. an unwanted flow of heat d. all of the above
all of the above
Substances absorb heat energy by the process of a. radiation b. conduction c. convection d. all of the above
all of the above
Which of these are good insulators? a. wood b. snow c. feathers d. all the above e. none of the above
all the above
Glass in a florist's greenhouse acts as a one-way valve in that it a. cuts off unwanted radiation b. is transparent only to lower-frequency waves c. lets light energy flow only in one direction d. allows high-frequency waves in and blocks low-frequency waves exiting
allows high-frequency waves in and blocks low-frequency waves exiting
If no molecular collisions occurred in a sample of gas, temperature of the gas would a. increase b. be unaffected c. decrease
be unaffected
A liter of cold water will warm faster in sunlight in a a. red pot b. black pot c. silver pot d. none of the above
black pot
A liter of cold water will warm faster in sunlight in a a. red pot b. black pot c. silver pot d. none of the above
black pot
Blow on your hand with your mouth open. Then do the same with your lips puckered and you'll find a. the breath from puckered lips a. the breath from puckered lips is cooler b. a difference in temperature c. both of these d. neither of these
both of these
Newton's law of cooling applies to objects undergoing a. warming b. cooling c. both of these d. neither of these
both of these
Solar power is used in many parts of the world for a. heating water b. generating electricity c. both of these d. neither of these
both of these
Steam that issues from a pressure cooker a. cools as it expands b. is invisible c. both of these d. neither of these
both of these
A parcel of warmed air rises due to a. increased energy of its molecules b. buoyancy c. random molecular motion d. radiation
buoyancy
In terms of transferring heat, red-hot wooden coals a. conduct poorly b. convect poorly c. radiate poorly d. conduct quite well
conduct poorly
If air were a better conductor, at nighttime Earth would be a. considerably colder b. not appreciably different in temperature c. considerably warmer
considerably colder
Soaring birds and glider pilots can remain aloft for hours without expending power, due to a. convection b. conduction c. radiation d. all of the above
convection
If a volume of air is warmed, it expands and tends to a. cool b. warm c. neither of these
cool
If a volume of air is warmed, it expands and tends to a. cool b. warm c. neither of these
cool
If the composition of the upper atmosphere were altered to permit a greater amount of terrestrial radiation to escape, Earth would be a. warmer b. quite unaffected c. cooler d. none of the above
cooler
If a pizza radiates more energy than it absorbs, its temperature a. decreases b. increases c. is unaffected d. none of the above
decreases
To save energy while you leave your warm house for a half hour on a cold day, turn the thermostat a. to room temperature b. down c. up
down
The heat we enjoy on a sunny day is due mainly to the Sun's a. enormous size b. high surface temperature c. relatively close distance d. none of the above
enormous size
Energy transfer by convection is primarily restricted to a. gases b. liquids c. fluids d. solids e. none of the above
fluids
A good absorber of radiation is a a. poor emitter of radiation b. good reflector c. good emitter of radiation d. none of the above
good emitter of radiation
An apple pie will be a net emitter of energy when its temperature is a. higher than its surroundings b. lower than its surroundings c. none of these
higher than its surroundings
In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of a. hydrogen b. nitrogen c. oxygen d. all the same
hydrogen
If you were caught in freezing weather with only a candle for heat, you would be warmer in a. tent b. car c. wooden house d. igloo
igloo
If a pizza absorbs more energy than it emits, its temperature a. is unaffected b. decreases c. increases d. none of the above
increases
When a volume of air is compressed, air temperature a. increases b. decreases c. neither of these
increases
When a hot object makes thermal contact with a cold object, the direction of a. internal energy flow is from hot to cold b. temperature is from hot to cold c. both of these d. neither of these
internal energy flow is from hot to cold
On a cold day your feet feel warmer on a rug than on a tile floor because a rug a. for the same mass has more internal energy than tile b. is a poorer conductor c. is usually warmer than tile d. all of the above e. none of the above
is a poorer conductor
On a cold day your feet feel warmer on a rug than on a tile floor because a rug a. for the same mass has more internal energy than tile b. is a poorer conductor c. is usually warmer than tile d. all of the above e. none of the above
is a poorer conductor
When an object absorbs as much as it radiates a. it remains at about the same temperature b. it is a net radiator c. it is a net absorber d. none of the above
it remains at about the same temperature
Hydrogen and oxygen molecules in a sample of gas have the same temperature. This means the hydrogen molecules, on average, have the same a. speed, but more kinetic energy b. speed and the same kinetic energy c. kinetic energy, but more speed d. kinetic energy, but more speed e. speed, but less kinetic energy
kinetic energy, but MORE speed
If a poor absorber of radiation were a good emitter, its temperature would be a. same as it surroundings b. less than its surroundings c. more than its surroundings
less than its surroundings
A blueberry pie will be a net absorber of energy when its temperature is a. higher than its surroundings b. lower than its surroundings c. none of these
lower than its surrounding
When coal dust is spread on snow on a sunny day a. no change in melting rate occurs b. less melting occurs c. more melting occurs
more melting occurs
Which of these are good conductors? a. wood b. feathers c. snow d. all the above e. none of the above
none of the above
To save energy while you leave your cool house for a half hour on a hot day, turn the temperature setting on the air conditioner a. to room temperature b. down c. up d. off altogether
off altogether
A good reflector of radiation is a a. good emitter of radiation b. poor absorber of radiation c. good absorber of radiation d. none of the above
poor absorber of radiation
A good heat conductor is a. a poor insulator. b. a good insulator. c. neither a poor nor a good insulator.
poor insulator
The form of heat transfer that doesn't depend on a medium is a. conduction b. radiation c. convection d. all of the above
radiation
Molecules in a region of expanding air more often collide with neighboring molecules that are a. approaching b. nearly out of range c. receding
receding
When you're ready for eh hottest sips of coffee, add cream a. when you are ready to drink the coffee b. right away c. at any time
right away
The higher the temperature of an object, the a. shorter the wavelengths it radiates b. makes no difference in the wavelengths it radiates c. longer the wavelengths it radiates
shorter the wavelengths
Solar power is the rate at which a. the atmosphere absorbs energy b. the Sun emits energy c. solar energy is received from the Sun d. all of the above e. none of the above
solar energy is received from the Sun
Sun's radiant energy is composed of shorter wavelengths than Earth's due to Sun's greater a. surface temperature b. size c. both of these d. neither of these
surface temperature
Heat normally flows from objects of high a. internal energy to objects of low internal energy b. temperature to objects of low temperature c. both of these d. neither of these
temperature to objects of low temperature
A water-filled paper cup held in a flame will not catch fire. This is because a. paper is a poor conductor of heat b. water is an excellent conductor c. the inside of the paper is wet d. the paper cup cannot become appreciably hotter than the water it contains
the paper cup cannot become appreciably hotter than the water it contains
Waves emitted by the Sun and terrestrial wave emissions are a. entirely different kinds of waves b. identical c. the same except for their frequencies and wavelengths
the same except for their frequencies and wavelengths
At the same temperature, which has greater average speed in the air? a. very light molecules b. heavier molecules c. both have equal average speeds
very light molecules
Which is the most abundant greenhouse gas in Earth's atmosphere? a. water vapor b. nitrogen c. carbon dioxide d. none of the above
water vapor
Both black and white road surfaces radiate energy. If both roads start the night at the same temperature, at the end of a starry night the cooler road surface will be A) the black surface. B) the white surface. C) Neither - there is no difference.
white
A block of wood and a block of copper will feel neither hot nor cold to the touch when they each have a. your temperature b. equal temperatures c. equal conductivities d. none of the above
your temperature