Across
- 4. Lowest-frequency electromagnetic wave.
- 9. The release of energy as light.
- 11. A thin beam of light traveling in a straight line.
- 14. When light bounces off a surface.
- 15. Number of wave cycles per second.
- 16. Idea that light is made of energy packets.
- 20. Higher-energy light that can cause sunburn.
- 21. Material that lets light pass clearly.
- 22. Electromagnetic radiation felt as heat.
- 23. Energy traveling through space as waves.
- 24. Number used to calculate photon energy.
Down
- 1. The part of the electromagnetic spectrum humans can see.
- 2. Tool that separates light into colors.
- 3. High-energy waves used to look inside the body.
- 5. Energy that travels in invisible waves through space.
- 6. When light energy is taken in by a material.
- 7. Highest-energy electromagnetic radiation.
- 8. A type of wave that carries light energy.
- 10. About 3.00 × 10^8 m/s in a vacuum.
- 12. When light passes through a material.
- 13. Distance between two peaks of a wave.
- 17. Material that blocks all light.
- 18. Light that contains all wavelengths of color.
- 19. A device that senses or measures light.