Revision Questions

1. What is another name for heat radiation?

2. What do objects which are hotter than their surroundings do?

3. What do objects which are colder than their surroundings do?

4. How do you know that heat radiation can travel through space?

5. What kinds of surface are good emitters of heat radiation?

6. Give an example of an object that has this surface so that it emits lots of heat quickly.

7. What kinds of surface are poor emitters of heat radiation?

8. Give an example of an object with this surface so that it does not emit heat radiation quickly.

9. What kinds of surface are good absorbers of heat radiation? Give an example.

10. What kinds of surface are good reflectors of heat radiation? Give an example.

11. How does heat energy pass through solids?

12. Describe what happens to the particles in the solid when heat energy flows through it.

13. What kinds of material are poor conductors of heat energy?

14. Why are metals good thermal conductors?

15. Why does hot air rise?

16. Why is the heating element in a kettle near the bottom?

17. Describe how the water in a kettle moves when it is being heated?

18. Where would be the best place to put the cooling element in a fridge? Why?

19. Some electrical components have cooling fins which help to stop them overheating. How would you design them so that they emitted as much heat as possible?