1. Energy in Our Life

2. Miroslav Hruška Czech Republic

3. Our school

4. Electromagnetic radiation …is a form of ENERGY

5. Forms of E-M radiation radio waves microwaves infrared radiation visible radiation (light) ultraviolet radiation X-rays gamma rays

6. Electromagnetic waves wavelength - in metres frequency - in hertz

8. Wave formula wave speed = = frequency x wavelength c = 300,000,000 m/s the higher frequency the lower wavelength

9. Differences in sources in penetrability in impact on people in use

10. Radio waves

11. Microwaves - oven

12. Microwaves - communication

13. Microwaves - radar

14. Thermal radiation infrared radiation visible radiation = light ultraviolet radiation

15. Thermal radiation - sources Sun and other stars light bulb hot oven infrared heater melting iron hot lava

16. Thermal radiation formula The hotter a body is, the shorter wavelengths it emits, and the more energy it looses.

17. Infrared radiation - use thermography night vision infrared heating remote control

18. Infrared radiation - thermography

19. Infrared radiation – night vision

20. Infrared heating

21. Infrared photography

22. Light from 390 nm to 790 nm

23. Light spectrum prism  spectrum

24. Light - spectroscopy spectral analysis => chemical composition

25. Laser Light Amplification by Stimulated Emission of Radiation

26. Laser – optical recording CDred laser 780 nm DVDred-orange 650 nm Blu-ray“blue” (violet) 405 nm

27. UV radiation UVA 315-390 nm UVB 280-315 nm UVC 100-280 nm

28. UV radiation

30. X-rays

32. Gamma rays

34. Gamma rays – in medicine

35. Thank you!

36. Electromagnetic radiation © Miroslav Hruška, 2012