Chapter 16 physics exam #3

The planet Earth loses heat mainly by

radiation

A good heat conductor is

a poor insulator

Objects that radiate relatively well

absorb radiation relatively well

Thermal conduction mostly involves the motion of _______.

electrons

Energy transfer by convection is primarily restricted to

fluids

Thermal convection applies mainly to _______.

fluids

When your foot stands on a tile floor, thermal energy always flows _______.

from either your foot or the tile depending on the temperature of the tile.

A good absorber of radiation is a

good emitter of radiation

Metals are both good heat conductors and good electrical conductors because of the

looseness of outer electrons in metal atoms

Warm air rises because faster-moving molecules tend to move to regions of less

density and less pressure

Substances absorb heat energy by the process of

convection, radiation, conduction

When air rapidly expands, its temperature normally _______.

decreases

The relation ƒ ~ T tells us that high-temperature sources emit electromagnetic waves of _______.

high frequency

Your feet feel warmer on a rug than on a tile floor because a rug

is a better insulator than tile

Heat travels from the Sun to the Earth by the process of _______.

radiation

The higher the temperature of an object

the shorter the wavelengths it radiates