Physics Chapter 22

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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.


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