Waves

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Across
  1. 3. The number of periods or regularly occurring events of any given kind in unit of time.
  2. 5. BOOM BOOM :D
  3. 6. The distance, measured in the direction of propagation of a wave.
  4. 7. The part of a wave with greatest magnitude; the highest part of a wave.
  5. 8. One of the extremely small constituents of matter, as an atom or nucleus.
  6. 9. The process in which energy is emitted as particles or waves.
Down
  1. 1. One half the full extent of a vibration, oscillation, or wave.
  2. 2. Vigor, force, or potency.
  3. 4. A wave in which the direction of displacement is the same as the direction of propagation.
  4. 6. It's pretty obvious. (pl.)