1. 6.6 Electromagnetic Waves
25 March 2017
6.6 Electromagnetic Waves
Think about:
How well behaved you are
How good you are at science
How much you like chocolate hob nobs

2. Aims Describe visible light as part of the electromagnetic spectrum
State other types of radiation

8. Electromagnetic waves

9. Travel through empty space

10. Travel at km/s

11. Transverse waves

12. They transfer energy

13. LIGHT SOUND Light vs Sound Example of wave Type of wave
Speed in air / km/s
Material of medium

14. LIGHT SOUND Light vs Sound Example of wave Type of wave Transverse
Longitudinal
Speed in air / km/s
340
Material of medium
No material required
Solid, liquid, gas

15. LIGHT SOUND LIGHT SOUND
Example of wave
LIGHT
SOUND
Type of wave
Speed in air / km/s
Material of medium
Example of wave
LIGHT
SOUND
Type of wave
Speed in air / km/s
Material of medium

16. Electromagnetic radiation actually comes in packets or lumps
Electromagnetic radiation actually comes in packets or lumps. I call these packets ‘quanta’. A quanta of light is called a photon. Nobel prize please…

17. The higher the frequency, the more energy the photon has

18. Intensity
Energy of each photon
Number of photons arriving each second

19. The electromagnetic spectrum

23. Accelerated electrons
Radio waves
Accelerated electrons

24. Radiowaves
Communications: TV, mobile phones, local radio, police

25. Molecular transitions
Microwaves
Molecular transitions

26. Microwaves
Microwaves ovens, communicating with satellites, RADAR

27. Molecular transitions
Infrared
Molecular transitions

28. Infra-red
Search and rescue teams, detect circulation problems, (cancer, arthritis), astronomy, burglar alarms

29. Atomic transitions and electron acceleration
Light
Atomic transitions and electron acceleration

30. Ultraviolet
Atomic transitions

31. UV
Produce vitamin D in our skin, suntan, skin cancer

32. Electron transitions and collisions
X-rays
Electron transitions and collisions

33. X-rays
X-rays (bones, teeth), check welds and joints, food

34. Nuclei transitions and annihilation
Gamma rays
Nuclei transitions and annihilation

35. Gamma rays
Make Hulks, sterilise food and utensils, tracers, radiotherapy

36. 3.13
recall the detrimental effects of excessive exposure of the human body to electromagnetic waves

42. Make an EM spectrum booklet
Guest starring Mr. Simon Porter

59. The EM spectrum
You now have seven sections to fill in with information regarding the seven types of electromagnetic radiation
Include uses, dangers, detectors, examples and origins if you can
The better you make it the better it will help your revision