Physics

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Across
  1. 3. The change in frequency or wavelength due to a moving source or observer.
  2. 5. A type of wave that travels through Earth during an earthquake.
Down
  1. 1. The distance between two consecutive crests or troughs in a wave.
  2. 2. The number of wave cycles that pass a point in one second.
  3. 4. The perception of how high or low a sound is.
  4. 6. The distance an object travels per unit of time.