WAVES crossword puzzle :)

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Across
  1. 2. Longest wavelength waves on the electromagnetic spectrum
  2. 4. Distance from the middle line of a wave up to the crest
  3. 8. Bottom point of a wave
  4. 13. Top point of a wave
  5. 14. Distance from one crest to the next, measured in meters
  6. 16. E = hv gives the energy of one of these
  7. 18. speed of _______ = (wavelength) x (frequency)
  8. 19. The state an atom is in after it takes in energy
  9. 20. In 3.00 x 10 to the blank m/s, this exponent spelled out in words
  10. 21. What electrons do when light of a high enough frequency hits the metal
  11. 22. Below a certain frequency no electrons come out, no matter this property of the light
Down
  1. 1. The only part of the spectrum our eyes can see
  2. 3. Waves just longer than visible light
  3. 4. What atoms do to energy in order to become excited
  4. 5. Unit that the energy of one photon is measured in
  5. 6. Minimum amount of energy that can be gained or lost by an atom
  6. 7. Waves just shorter than visible light
  7. 9. What the symbol hv stands for, measured in hertz
  8. 10. Effect where light of a certain frequency causes metals to eject electrons
  9. 11. All electromagnetic waves travel at 3.00 x 10 to the 8th m/s in this
  10. 12. higher frequency = _______ wavelength
  11. 15. What every element's atomic emission spectrum is, so it can identify the element
  12. 17. Unit of frequency, also written as s to the negative one
  13. 18. lower frequency = ________ wavelength
  14. 23. Acronym for the order of the colors in visible light