Crossword

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Across
  1. 2. the third letter of the Greek alphabet
  2. 3. the rate at which someone or something is able to move or operate.
  3. 7. the throwing back by a body or surface of light, heat, or sound without absorbing it.
  4. 9. strength or energy as an attribute of physical action or movement.
Down
  1. 1. having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays.
  2. 4. is the branch of science
  3. 5. the fourth letter of the Greek alphabet
  4. 6. having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves.
  5. 8. the SI base unit of lengthcrest