Crossword

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Across
  1. 4. Series of coloured lines
  2. 7. Apparently rather than actually
  3. 8. Objects in motion through space
  4. 10. Irregular fluctuation of velocity
  5. 11. Direction of vibration of wave in one plane
  6. 13. Constituent of a whole
  7. 14. Mathematical study of continuous change
  8. 15. Rotation about _ _ _ _
  9. 16. Objects that emit their own light
Down
  1. 1. Action done without any perceptible time
  2. 2. Used to measure scientific quantities
  3. 3. Measure to enhance clarity
  4. 5. Tube with a small bore
  5. 6. Term commonly used in celestial mechanics
  6. 8. A general scientific theorem or law
  7. 9. A carrier to transfer energy
  8. 12. Absolute value of a real number
  9. 14. Laser is a _ _ _ _ _ _ _ _ light