Light and sound

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Across
  1. 4. SLOWING DOEN AND BENDING OF LIGHT
  2. 5. NEEDED TO MAKE THINGS HAPPEN OR CHANGE
  3. 6. MATERIAL THROUGH WHICH ELECTROMAGNETIC WAVES TRAVEL
  4. 7. LONGITUDINAL WAVE WE NEED TO HEAR
  5. 8. TRANSVERSE WAVE WE NEED TO SEE
  6. 10. CREST OF A WAVE
Down
  1. 1. VIBRATION AT RIGHT ANGLES TO DIRECTION OF TRAVEL
  2. 2. WAY OF TRANSFERRING ENERGY
  3. 3. PARALLEL TO DIRECTION OF TRAVEL
  4. 9. BOTTOM OF A WAVE