Across
- 5. a material that allows almost all of the light striking it to pass through, and through which objects can bee seen clearly
- 6. a material through which light does not pass
- 7. the capacity to do work
- 8. a type of wave created by vibrating particles
- 9. electromagnetic radiation that you can see
Down
- 1. the energy carried by an electromagnetic wave
- 2. a person's perception of intensity (energy)
- 3. light and other EM waves travel through a vacuum at a speed of about 300,000 km/s
- 4. a material that allows most of the light that strikes it to pass through, but through which objects appear blurry