Across
- 1. a reflection of sound
- 6. light that changes the direction or bends
- 8. let's light past through
- 9. Is a form of energy produced by VIBRATION
- 10. a steam of light pointed in one direction
- 11. a length between the compression in a sound wave
- 12. movement
Down
- 2. a curved lens like the inside of a sphere
- 3. a thing that moves back and forth
- 4. unite of measure of an frequency
- 5. a thing that reaches the ear
- 7. light bounces off an object.