old and new word

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Across
  1. 1. Equal
  2. 4. Length of one wave
  3. 6. Measure of distance over time
  4. 7. push or pull
  5. 8. dominant direction of wave propagation
  6. 10. Study of motion and energy
  7. 11. Bottom of a wave
Down
  1. 2. Height of a wave
  2. 3. People encounter Infrared waves every day; Ultraviolet with a corresponding frequency around 30 PHz
  3. 5. in general sense, is the act or process
  4. 9. Top of a wave