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6. Thermal radiation cannot travel through a vacuum.

  • False
  • True

7. What is an example of a vacuum?

  • space
  • a hoover
  • the air around us

8. Infa-red radiation does not involve particles.

  • True
  • False

9. What is the best absorber of radiation?

  • dark, matt surfaces
  • light, shiny surfaces

10. What is the best emitter of radiation?

  • dark, matt surfaces
  • light, shiny surfaces

11. Why are most metals good conductors?

  • They contain pockets of trapped air
  • They contain free electrons
  • They are negatively charged
  • They are positively charged

12. Why are materials, such as fibreglass, good insulators?

  • They contain free electrons
  • They are positively charged
  • They contain pockets of trapped air
  • They are negatively charged

13. How is heat transferred through a solid?

  • particles gain kinetic energy and vibrate more.
  • particles gain kinetic energy and start vibrating.

14. What happens when metals are heated?

  • air pockets gain thermal energy and this is passed through the metal.
  • electrons gain kinetic energy, and move through the metal.
  • electrons gain kinetic energy and move through the metal, and transfer energy when they collide.
  • particles gain kinetic energy and vibrate more
  • particles gain kinetic energy and start vibrating

15. What are poor conductors called?

  • Insulators
  • Poor conductors

16. Where does convection occur?

  • gasses
  • fluids
  • solids

17. What happens when a liquid or gas is heated?

  • It becomes less dense
  • It becomes more dense

18. How does convection occur?

  • Hot solid rises
  • Hot liquid or gas rises
  • Hot gas rises
  • Hot liquid rises

19. Why do hotter substances rise?

  • They become less dense
  • They become more dense

20. How do we reduce heat loss by conduction?

  • Preventing convection currents from being set up
  • Trapping a layer of air
  • Using light, shiny surfaces