Physics Chapter 22
A means of heat transfer by movement of the heated substance itself is called _____ .
Convection
T/F: Generally, good absorbers of radiant energy are poor emitters of radiant energy.
False
A piece of metal will feel colder than a piece of wood at the same temperature. Why?
Metals, in general, are good heat conductors.
Two pots are filled with boiling water. The pots are exactly the same size, but one pot is white and the other is black. Which pots cools faster?
The black pot.
Which cools at the faster rate, a pot of boiling water left at room temperature or a pot of lukewarm water the same size left at room temperature?
The boiling water.
T/F: An example of convection is the sea breeze that occurs during the day when the land is warmer than the water.
True
T/F: The pupil of the eye appears black because it allows radiant energy to enter with no reflection.
True
A good absorber of radiation is
a good emitter of radiation.
A good reflector of radiation is
a poor absorber of radiation.
A piece of paper wrapped around a thick metal bar will not ignite when touched with a lit match because
all of the above
The reason sea breezes are usually from the sea toward the land during the day is that
all of the above
The reason you can hold your fingers beside a candle flame without getting hurt is that
all of the above
If you were caught in freezing weather with only a candle for heat, you would be warmest in
an igloo
The lower atmosphere is directly warmed
by absorption of terrestrial radiation.
The transfer of energy within materials or between different materials that are in direct contact is called _____
conduction
Assuming volumes are equal, which of the following will take the least amount of time to become ice when placed in a freezer?
cool water
If a volume of air is warmed, it expands. If a volume of air expands, it
cools
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
down 10 degrees or more.
Heat transfer by conduction in metals occurs when
electrons bump into atoms and other electrons.
T/F: In conduction, the collisions between particles transfer thermal energy and matter.
false
T/F: In radiation, heat is transmitted in the form of matter.
false
Energy transfer by convection is primarily restricted to
fluids
In a florist's greenhouse, glass acts as a one-way valve, letting
high-frequency light in and preventing low-frequency radiation from escaping.
Plastic foam is a good heat
insulator
A cup of hot coffee will cool faster if it
is black
Heat transfer by convection occurs when
large numbers of atoms move from place to place.
Radiation from the sun often gets trapped in Earth's atmosphere. The reason for this is that
long-wavelength radiation is absorbed by the atmosphere.
If a poor absorber of radiation were a good emitter, its temperature could remain
lower than that of its surroundings.
Infrared radiation is a form of
radiant energy.
Energy transmitted by electromagnetic waves is called _____ .
radiation
Heat travels from the sun to Earth by
radiation
Planet Earth loses heat primarily by
radiation
The metallic coating on the glass surfaces of a Thermos vacuum bottle reduces the amount of energy transferred by
radiation
The reason light-colored clothes help keep you cool in warm weather is that clothes of light color
reflect a lot of energy.
Radiant energy transmitted by stars other than our sun is called _____ .
stellar energy
Global warming by the greenhouse effect mostly results from the fact that an atmosphere with excess carbon dioxide is less transparent to
terrestrial radiation.
Newton's law of cooling says that the rate of cooling depends on
the temperature difference between an object and its surroundings.
At night, a sea breeze results when
warm air over the shore rises and cooler air from the ocean takes its place.
Firewalkers who walk barefoot on red-hot wooden coals depend on
wood's poor conductivity.
