Thermal energy transfer

Which way does heat flow?

• from warmer objects to colder ones

• from colder objects to warmer ones

Why are gases poor conductors of electricity?

• 
  Particles are close together and collisions are more frequent

• Particles are close together and collisions are less frequent

• 
  Particles are far apart and collisions are less frequent

• Particles are far apart and collisions are more frequent

Which state of matter is the best conductor?

• solid

• liquid

• gas

Which is an example of conduction?

• thermal energy from the Sun transferring to the Earth

• saucepans have metal bodies and plastic handles

• a radiator circulating warm air around a room

Which is an example of radiation?

• thermal energy from the Sun transferring to the Earth

• saucepans have metal bodies and plastic handles

• a radiator circulating warm air around a room

Which is an example of convection?

• thermal energy from the Sun transferring to the Earth

• saucepans have metal bodies and plastic handles

• a radiator circulating warm air around a room

What are metals such good conductors?

• their particles are very close together

• they have large atoms compared to similar solids

• their particles vibrate with a large amplitude

• they have delocalised electrons which make more collisions

For conduction to occur objects must be...

• touching

• solids

• metals

• at the same temperature

Using night-vision goggles to see people in the dark is an example of

• conduction

• convection

• radiation

Having an air conditioner up high on the walls of a room is an example of...

• conduction

• convection

• radiation