1. Electromagnetic spectrum

2. Visible light

3. Visible light λ ≈ 700 nm λ ≈ 420 nm

4. Ultraviolet waves λ ≈ 700 - 420 nm

5. Ultraviolet waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm

6. X-rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm

7. X-rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm

8. Gamma rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm

9. Gamma rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001 – 0.00001 nm

10. Infrared waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001 – 0.00001 nm

11. Infrared waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m

12. Microwaves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m

13. Microwaves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m

14. Radio waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m

15. Radio waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m λ ≈ 10 -1 - 10 3 m

16. Electromagnetic spectrum λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001-0.00001nm λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m λ ≈ 10 -1 - 10 3 m

17. Electromagnetic spectrum Long Wavelength Short Wavelength

18. Electromagnetic spectrum Long Wavelength Short Wavelength Low Frequency High Frequency

19. What do they all have in common? λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 10 -12 - 10 -14 m λ ≈ 10 -4 - 10 -6 m λ ≈ 10 -2 - 10 -3 m λ ≈ 10 -1 - 10 3 m

21. What else do you need to know?

22. Electromagnetic spectrum Long Wavelength Short Wavelength Low Frequency High Frequency

26. Dangers of microwaves and X-rays