Waves

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Across
  1. 5. waves that travel through matter or empty space
  2. 6. wavelength times frequency
  3. 8. Distance between one point to the nearest point in the wave
Down
  1. 1. mechanical wave that causes particles in matter to move back and forth
  2. 2. needs a medium to travel through
  3. 3. mechanical wave that causes particles in matter to at right angles
  4. 4. Number of wavelengths that pass a given point in one second
  5. 7. object that the waves travel through
  6. 9. One half distance between crest and trough in traverse wave
  7. 10. SI unit for frequency