Across
- 2. the number of wave crests that pass through during a certain amount of time
- 4. the smallest type of wave on the EMS
- 7. visible colour with the largest wavelength
- 8. waves with ______ ______ are less harmful to humans
- 10. waves with ______ ______ are harmful to humans
- 14. this wave is used for satellites and cell phones
- 15. ______ wavelengths=higher frequency
- 18. light rays are absorbed
- 20. invisible to the human eye but we can feel it as heat and it has a wavelength just larger than red
- 21. light rays are bent
- 22. unit used to measure frequency
Down
- 1. the distance between two crests or troughs on a wave
- 3. invisible to the human eye that has a wavelength just smaller than violet
- 5. a blend of all the colours on the visible light spectrum
- 6. light rays bounce back
- 9. the highest point above the resting line of the wave
- 11. visible colour with the smallest wavelength
- 12. light travels through without being scattered, absorbed or reflected
- 13. the height of the wave from the resting point to the crest or trough
- 16. _______ wavelengths=lower frequency
- 17. this wave is used in the medical field to look at images inside the body
- 19. the largest type of wave on the EMS
- 21. acronym used to remember visible colours on the electromagnetic spectrum