Powering our World

3. The transfer of heat energy by vibrations from one atom to another
4. Focuses or disperses a light beam by means of refraction
6. The transfer of heat by electromagnetic radiation
7. Light rays coming together to meet at a common point
9. Energy when an atom is split
11. Transferring signals from the retina at the back of the eye to the brain
14. When heated molecules gain more energy & move faster. This leads to more collisions and the particles moving further apart
17. The angle of incidence is equal to the angle of reflection.
18. A mirror that is curved inwards
19. Is the total energy
22. The light ray that strikes a reflective surface
23. Stored energy
25. The gap in the iris through which light centres the eye
27. The angle at which incoming light rays approaches a surface.
28. Energy stored in food and in a battery
31. To control the amount of light entering the pupil
33. The units for energy
35. A line perpendicular to the surface.
36. When cooled molecules lose energy & slow down. This leads to less collisions and the particles move closer together.

1. Energy cannot be created or destroyed only transformed
2. Materials that conduct heat well
5. Energy of an object being held above the ground
8. The angle between the reflected ray and the normal
10. A scale of temperature
12. A mirror that is curved outwards
13. Energy is a stretched or compressed spring
15. The bending of light as it passes from one transparent object to another
16. Is the measure of the average kinetic energy of the particles
20. Outgoing ray
21. Energy of a vibrating speaker
24. The energy of a moving object
26. Light rays that are spreading out
29. The substance a light wave travels through
30. Energy is transferred by mass motion
32. The back of the eye with light sensitive cells
34. The transparent front part of the eye