Across
- 5. a material that does not allow energy to travel
- 7. how high or low a sound is
- 8. a vibration that can be heard
- 9. the ability to do work
- 10. bending of light
- 12. a form of energy that allows us to see
Down
- 1. loudness of sound
- 2. allows all light to pass
- 3. a material that allows energy to travel
- 4. allows some light to pass
- 6. bouncing of light
- 11. allows no light to pass