The Electromagnetic Spectrum
Across
- 3. color that has the longest wavelength
- 5. used in treating illnesses and making images
- 8. used to broadcast communication signals
- 11. form of energy given off by the sun
- 12. the colors of the EM spectrum seen by humans
- 14. amount given off depends on temperature
- 15. used in heating foods and cellular phones
- 17. color that has the shortest wavelength
- 19. transfer of energy as electromagnetic (EM) waves
- 20. shorter wavelength than violet light
- 22. can cause damage to skin and eyes
- 23. what we perceive when we see all wavelengths
Down
- 1. southern lights
- 2. northern lights
- 4. travels at 300,000,000 m/s
- 6. beyond red; can be seen by some animals
- 7. longer wavelength than red light
- 9. three color ranges of light seen by the eye
- 10. can pass through most tissue but absorbed by bones
- 13. small dots of red, green, and blue light
- 16. range of frequencies in EM waves
- 18. tool used to split colors by wavelength
- 21. beautiful display of special light near the poles