New and Old words

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Across
  1. 1. third letter of the Greek alphabet
  2. 4. A push or pull
  3. 6. electromagnetic radiation
  4. 7. how far somthing has gone
  5. 9. Reduction in speed or rate
  6. 11. a substance captures and transforms energy
Down
  1. 2. change of the velocity
  2. 3. The branch of science that deals with the structure of matter and how the fundamental constituents of the universe interact.
  3. 5. the return of light or sound waves from a surface
  4. 7. The fourth letter of the Greek alphabet
  5. 8. how fast somthing has gone
  6. 10. The movement of somthing animal human etc