The Beautiful Crosswords Volume 2 (all on pages 91-97)

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Across
  1. 2. The distance between corresponding points on adjacent waves
  2. 4. the color of light emitted by excited hydrogen atoms
  3. 8. The state of an atom when its potential energy is greater than it has in its ground state
  4. 9. emitted when an excited hydrogen atom falls back from an excited state to its ground state
  5. 11. All forms of the electromagnetic spectrum
  6. 15. The firstname of Mr. Plank, who proposed that light was emitted in particles.
  7. 16. The lowest energy state of an atom.
  8. 17. True or false: X rays are part of the electromagnetic spectrum
  9. 18. the series of visible light frequencies
Down
  1. 1. Represented as c in the equation c = (lamda)v
  2. 3. the first name of Mr. Hertz, who invented the Hertz
  3. 5. The lamda represents this
  4. 6. A unit of meausrement expressing one wave per second
  5. 7. The minimum quantity of energy that can be lost or gained by an atom
  6. 8. A form of energy that exhibits wavelike behavior as it travels through space
  7. 10. the series of infrared light frequencies
  8. 12. the ultraviolet series of frequencies
  9. 13. The emission of electrons from a metal when light shines on a metal
  10. 14. The number of waves that occur in a specific period of time, usually one second