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Across 1. particles bunched together in a sound wave 7. propeller/fan shaped object driven round by steam in a power station 8. reflected sound 9. water vapour in the air ????? on a cold mirror 10. word to describe a gas or a liquid 11. transfer of heat by vibrating particles in a solid 13. ray going into a mirror 16. change of direction/speed of light as it enters glass 17. gamma x-ray ultraviolet light infrared ?????? radio 18. solar ???? generates electricity from sunlight 22. distance from one wave peak to the next wave peak 24. raising the height of an object increases its ? potential energy 26. sound energy from a radio is ? energy (efficiency question) 27. infrared radiation is trapped in the atmosphere called the ? effect 28. excellent metallic conductor of heat 29. space with no particles prevents conduction and convection 31. spectrum of gamma, x-ray, ultraviolet etc 33. moving objects have this energy 34. heat energy from a radio is ? energy (efficiency question) 36. type of wave found in sound 40. electrical energy from water running downhill 42. coal, oil, natural gas, peat are all examples of.... (6,5) 44. type of wave found in water 48. transfer of heat by currents in a liquid or gas 49. heating a gas makes it less ????? causing it to rise 50. resists movement 51. springs and rubber bands store ? potential energy 53. nationwide network of power lines supplying electricity (8,4) 54. term for effect seen in light spectra of galaxies moving away 56. particles far apart in a sound wave 57. central region of an atom 58. arrow diagram to show efficiency 59. oil is an example of a ?????????, it reduces friction

Down 2. energy required to raise temperature of one kilogram by one degree (8,4,8) 3. methane gas from manure is an example of..... 4. sound wave with a large amplitude is very ???? 5. number of wave peaks passing a fixed point every second 6. energy sources that will not run out 12. unit of electricity on a bill (8-4) 14. food contains this energy 15. opposite to peak 19. fills a container and can have differing volumes 20. solar heating ????? heats water using solar energy 21. dark,???? surfaces are good at emitting radiation 23. randomly moving particles in metals that allow efficient heat transfer (4,9) 25. nuclear power from an aton splitting apart 26. element often used as a nuclear fuel 30. calculated by energy transferred divided by time taken to transfer 32. energy cannot be destroyed,only transferred, we call this ? of energy 35. height of wave or depth of wave from the middle 37. spreading of waves as they pass through a gap 38. unit of frequency 39. change from solid to gas without the liquid phase 41. step-up and step-down are examples of these 43. distance divided by time 45. energy source that heats water by pumping it into hot rocks underground 46. line drawn at 90 degrees to a plane mirror in a ray diagram 47. caused by release of sulphur dioxide (4,4) 52. light,????? surfaces are poor at emitting radiation 55. useful energy from a kettle filament