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The EM Spectrum

Prefixes nano (n) - 10 -9 – 0.000000001 micro (µ) - 10 -6 – 0.000001 milli (m) - 10 -3 – 0.001 kilo (k) - 10 3 – 1000 Mega (M) - 10 6 – 1000000 Giga (G) - 10 9 – 1000000000 Centi (c) – 10 -2 – 100 12 km = 12000m 15cm = 0.15m 700nm = 7.0 x 10 -7 m

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The EM Spectrum

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  1. Prefixes nano (n) - 10-9 – 0.000000001 micro (µ) - 10-6 – 0.000001 milli (m) - 10-3 – 0.001 kilo (k) - 103 – 1000 Mega (M) - 106 – 1000000 Giga (G) - 109 – 1000000000 Centi (c) – 10-2 – 100 12 km = 12000m 15cm = 0.15m 700nm = 7.0 x 10-7 m You don’t really need to know the small ones like milli and micro but it helps.... The EM Spectrum Waves (Definitions of Frequency/Wavelength/Wave equation/amplitude) Sterilisation/Kill Harmful Bacteria Radiotherapy Ionisation/How this causes cancer Gamma rays X-rays Used In Medicine X-Ray Photographs Fluorescence Skins Protection Ultraviolet Visible Optical Fibres Infra-red Infra-Red Cameras Heating and Absorption (Applies to all EM Waves but questions mainly on Microwaves and Infra-Red) Other Info Mobile Phones (Infra-Red, Bluetooth, Making calls etc) Used to heat things up How EM waves interact with matter Microwaves Absorb Reflect Emit Transmit Penetrate Used mainly for communication Radio Satellite Communication Ionosphere Alternating Current/Voltage (Aerials etc) Local Radio and TV Wavelength size comparison International Radio Can penetrate atmosphere? Info that can be sent Damage to human tissue Analogue and Digital signals (How waves used for communication can be sent) Sources Detectors Energy Frequency Wavelength Annotate me...

  2. EM Waves Interaction with Matter

  3. Wave Basics

  4. Prefixes

  5. Gamma Rays

  6. Radiotherapy

  7. Sterilisation of surgical instruments and killing bacteria in food

  8. X-Rays

  9. X-Ray Photographs

  10. Medical Physics

  11. Ultraviolet

  12. Flourescence

  13. Sun tans and melanin

  14. Ionisation of atoms

  15. Cancer

  16. Communications

  17. Visible Light

  18. Infra-Red

  19. Infra-Red Cameras

  20. Optical Fibres

  21. Microwaves

  22. Mobile Phones

  23. Heat Transfer using EM Waves

  24. Radiowaves

  25. Satellite Communications

  26. Local Radio and TV

  27. International Radio

  28. The Ionosphere

  29. Aerials and Alternating Currents

  30. Analogue and Digital Signalling

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