Electromagnetic Spectrum

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

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