Physics Crossword puzzle

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Across
  1. 6. Interaction between two charged particles and a electric field
  2. 8. when your answers are close to each other
  3. 10. a combination of two or more of the same type of wave
  4. 12. can be positive or negative or neutral
  5. 13. when a wave is sent back in the same direction it came from
  6. 14. the unit of measurement for force
Down
  1. 1. a law describing the electrostatic force between two particles
  2. 2. when you are close the the correct answer or spot
  3. 3. a particle whose properties are negligible
  4. 4. when a wave changes behavior as it moves through a small slit or opening
  5. 5. when a wave changes direction as its travels through a different medium
  6. 7. an electric field that has the same magnitude and direction throughout
  7. 9. a condition in space where particles experience a force of some kind
  8. 11. the unit of measurement for electric force