Heat transfer
a good absorber of radiation is
a good emitter of radiation
a good reflector of radiation is
a poor absorber of radiation
if a volume of air is warmed it expands. if a volume of air expands it
cools
heat transfer by conduction in metals occurs when
electrons bump into atoms and other electrons
Winds and weather patterns are good examples of radiation currents.
false
inferred radiation is a form of
radiant energy
Heat travels from the sun to Earth by
radiation
The 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
all objects above 0 K radiate energy
true
if you want to cool a cup of hot tea as fast as possible should you add a tablespoon of cool water as soon as you port the tea into the cup or just before you want to drink it
add just before you want to drink, change in temperature
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 warmer in
an igloo
the lower atmosphere is directly warmed
by absorption of terrestrial radiation
write a short paragraph or town on the differences between conduction and convection. give examples of each.
conduction- had to have direct contact, atoms collide to transfer energy convection- transfer of energy through currents, fluids
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
a good emitter of heat is also a good reflector of heat
false
heat transfer by means of atoms moving from place to place is conduction
false
heat transfer by means of electrons colliding with other electrons in a metal is convection
false
the absorption effect is the name given to the process whereby long-wavelength radiation enters a house through the windows is absorbed and reradiated by objects in the house and is unable to be retransmitted through the windows
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 earths 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
A piece of metal will feel colder than a piece of wood at the same temperature. Why?
metals in general are good heat conductors
The reason light-colored clothes help keep you cool in warm weather is that clothes of light color
reflect a lot of energy
Explain what the greenhouse effect is and how it promotes global warming. use Earth and the atmosphere or a florist's green house as an example
short sun rays enter the atmosphere, they cool but do not have enough energy to escape the atmosphere
global warming by the greenhouse effect mostly results from the fact that an atmosphere with excess carbon dioxide is less transparent to
terrestrial radiation
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 pot 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
newtons law of cooling says that the rate of cooling depends on
the temperature difference between an object and its surrounds
Heat that is transferred to us from the sun is transferred by radiation.
true
The rate of cooling of an object is proportional to the temperature difference between the object and its surroundings
true
a good reflector of heat is a poor absorber of heat
true
materials that are poor heat conductors are insulators
true
at night a sea breeze results when
warm air over the shore rises and cooler air from the ocean takes its place
explain why white clothing helps keep us cool on a sunny day whereas black clothing helps to warm us. which is the better reflector? which is the better absorber?
white- better reflector black- better absorber
Fire walkers who walk barefoot on red hot wooden coals depend on
wood's poor conductivity