Year 9

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Across
  1. 3. A type of circuit where components are connected on separate branches.
  2. 7. The part of the ear that vibrates when sound waves hit it.
  3. 9. What happens when opposite charges come near each other.
  4. 11. What happens when like charges come near each other.
  5. 12. The unit used to measure the loudness of sound.
  6. 13. The sudden release of built-up static electricity.
  7. 15. A measure of how much a material slows down the flow of electricity.
  8. 18. A lens that curves inward and spreads light rays apart.
  9. 20. A wave where particles vibrate in the same direction as the wave travels.
  10. 21. A lens that curves outward and brings light rays together.
  11. 25. A material that allows all light to pass through clearly.
  12. 27. A fluid-filled part of the inner ear that converts sound waves into electrical signals.
  13. 28. A rapid back-and-forth movement that produces sound.
  14. 31. The bouncing of light off a surface.
  15. 32. The angle between the incoming ray and the normal.
  16. 33. The flow of electric charge through a circuit.
  17. 34. The distance between two corresponding points on a wave.
  18. 35. The transfer of heat in liquids or gases by the movement of particles.
Down
  1. 1. A material that does not allow heat or electricity to flow easily.
  2. 2. A material that blocks all light from passing through.
  3. 4. An imaginary line drawn at 90° to a surface where light meets it.
  4. 5. A buildup of electric charge caused by friction.
  5. 6. A material that allows some light through but scatters it.
  6. 8. The height of a wave; determines how loud a sound is.
  7. 10. The number of wave vibrations that occur in one second.
  8. 14. The transfer of heat energy through electromagnetic waves without particles.
  9. 16. A material that allows heat or electricity to flow easily.
  10. 17. A type of circuit where components are connected one after another.
  11. 19. The measure of energy carried by charges in a circuit.
  12. 22. A thin flexible tube that transmits light by internal reflection.
  13. 23. The bending of light as it passes through substances of different densities.
  14. 24. The property of sound determined by frequency; higher frequency = higher pitch.
  15. 26. The angle between the reflected ray and the normal.
  16. 27. The transfer of heat through direct contact between particles.
  17. 29. A type of wave where the vibration is at right angles to the direction of wave travel.
  18. 30. A path through which electric current flows.