Waves

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Across
  1. 1. : the distance
  2. 4. : extending or lying across
  3. 5. : the top line of a hill
  4. 7. : the maximum displacement of a periodic wave
  5. 8. : the number of occurrences within a give time period
Down
  1. 2. : the charge in direction of a propagating wave(light or sound)when passing from one medium to anther
  2. 3. : the unit of the frequency ;one hertz has a periodic interval of one second
  3. 6. : the distance (measured in the direction of propagation) between two point in the same phase in consecutive cycles of a wave.