1. Electromagnetic spectrum

2. Visible light

3. λ ≈ 700 nmλ ≈ 420 nm

4. Ultraviolet waves λ ≈ 700 - 420 nm

5. Ultraviolet waves λ ≈ 700 - 420 nmλ ≈ 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 ≈ 10 -12 - 10 -14 m

10. Infrared waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 10 -12 - 10 -14 m

11. Infrared waves 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

12. Microwaves 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

13. Microwaves 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

14. Radio waves 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

15. Radio waves 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

16. Electromagnetic spectrum 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

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

20. What do they all have in common? They can travel in a vacuum They travel at 3 x 10 8 m.s -1 in a vacuum (the speed of light) They are transverse They are electromagnetic waves (electric and magnetic fields at right angles to each oscillating perpendicularly to the direction of energy transfer)

21. Mini-book

22. One type of EM wave for each page Each page should contain the wavelength and frequencies Each page should contain uses and other interesting information (including dangers) Attractive to look at (and funny?) Homework due Friday 29 th January

23. Mini-book Finish for homework. Due Friday 29 th January