physics

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Across
  1. 4. the throwing back by a body or surface of light, heat, or sound without absorbing it.
  2. 6. reduction in speed or rate
  3. 8. having a wavelength greater than the red light of the invisible light spectrum
  4. 10. having a wavelength shorter than that of the violet end of the visible spectrum
  5. 11. the action or process of moving or being moved
  6. 12. strength or energy as an attribute of physical action or movement.
Down
  1. 1. the SI unit of length
  2. 2. increase in the rate or speed of something
  3. 3. the third letter of the Greek alphabet
  4. 5. the rate at which something is going to move
  5. 7. an amount of space between two things or people
  6. 9. the forth letter of the Greek alphabet