Chapter 22 - Heat Transfer

Convection definition

A means of heat transfer by movement of the heated substance itself is called convection.

The reason you can hold your fingers beside a candle flame without getting hurt that....

Air convects heat well, hot air rises, = all of the above

A piece of paper wrapped around a thick metal bar will not ignite when touched with a lit match because...

All of the above

t or 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.

Newtons law of cooling says that the rate of cooling depends on....

The temperature difference between an object and its surroundings

t or f - The pupil of the eye appears black because it allows radiant energy to enter with no reflection.

True

If a volume of air is warmed, it expands. If a volume of air expands, it...

cools

suppose you want to save energy, and your 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 is metals occurs when

electrons bumpy into atoms and other electrons

A good reflector of radiation is...

poor absorber of radiation

infrared radiation is a form of

radiant energy

The metallic coating on the glass surface of a thermos cavuum bottle reduces the amount of energy transferred by...

radiation

heat travels from the sun to earth by

radiation

Energy transfer by convection is primarily restricted to...

fluids

Good conductors have...

"loose" outer electrons.

Stellar energy

Radiant energy transmitted by stars other than our sun

Energy transmitted by electromagnetic waves is called________

Radiation

Radiant energy transmitted by the sun is called ____________

Solar energy

the lower atmosphere is directly warmed by....

absorption of terrestrial radiation

The reason sea breezes are usually from the sea toward the land during the day 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

t to f - In conduction, the collisions between particles transfer thermal energy and matter.

false

A good absorber of radiation is

good emitter of radiation

In a florists 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 after if it is what color

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 atmosphere. the reason for that is...

long-wavelength radiation is absorbed by the atmosphere.

If a poor absorber of radiation were a good emitter, its temperature would be

lower than that of its surrounding

The planet Earth loses heat primarily by

radiation

The reason light-colored clothes help keep you cool in warm weather is that clothes of light color

reflects a lot of energy

global warming by the greenhouse effect mostly result 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

In convention, heat is transferred by the movement of the hotter substance from one place to another - t or f

true

Metal is a better conductor than wood - t or f

true

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

woods poor conductivity