Energy

Which describes how radiation moves?

• Radiation moves from a cooler object to a warmer object

• Radiation moves from a warmer object to a cooler object

• Radiation moves from a warm object to an object of the same temperature

• Radiation moves from a cool object to an object of the same temperature

Which material most likely gets the warmest when placed in the Sun?

• white cement

• beige sand

• brown mulch

• yellow pebbles

A thermogram taken outside a house shows high amounts of thermal energy around the windows but not around the roof.

Which conclusion supports the thermogram?

• The windows and the roof are energy efficient.

• The windows and the roof are not energy efficient.

• The windows are not energy efficient, but the roof is energy efficient.

• The windows are energy efficient, but the roof is not energy efficient.

Which best describes convection?

• It relies on the collision of particles within or between substances.

• It occurs in solids, liquids, or gases that are heated.

• It results when portions of a liquid cool and rise.

• It is driven by temperature differences within a fluid.

A student heats a liquid on a burner. What happens to the portion of liquid that first begins to warm?

• It loses energy.

• It becomes less dense.

• It sinks downward.

• Its molecules get closer together.

In which of these can convection not occur?

• gases

• solids

• liquids

• fluids

Which accurately completes the statement?

Conduction involves the transfer of electric charge or ___________ due to the movement of particles.

• thermal energy

• light waves

• protons

• neutrons

Which material is typically used as a thermal insulator?

• copper

• foam

• ceramic

• aluminum

A scientist designed a foam container to help keep frozen foods from melting. Which best explains how the foam works?

• It removes thermal energy from the air inside the container.

• It removes thermal energy from the frozen foods inside the container.

• It reduces the amount of thermal energy that is transferred from inside to outside the container.

• It reduces the amount of thermal energy that is transferred from outside to inside the container.

Which refers to the thermal energy that flows from one substance to another when the substances differ in temperature?

• heat

• temperature

• convection

• flow