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