1. The Electromagnetic Spectrum (: A spectrum is when white light is shone through a prism is then separated out into all the colours of the rainbow so now it is a visible spectrum.

2. Well.. For Starters (: In this power point I will be talking about the Electromagnetic Spectrum ! Yes, it may be very pretty and colourful but behind the colours there are many interesting things you need to know about it.

3. The following slides will be talking about the different waves that the Electromagnetic spectrum contain. The Electromagnetic Spectrum (: High frequency Short wavelength High energy Most penetrating Low frequency Long wavelength Low energy Least penetrating

4. Wavelength... Is the distance between crests of a wave ! Frequency... Energy... Is the number of occurrences within a given time period Is the power to change things/to make work

5. Radiowaves... Communication and astronomy There are no dangers Uses Dangers <10 Wavelength (cm) < 10 -5 <3 x 10 9 Energy (eV) Frequency (Hz)

6. Microwaves... Mainly for cooking, satellite and RADAR Internal tissue heating Uses Dangers 10 – 0.01 10 -5 – 0.01 3 x 10 9 – 3 x 10 12 Wavelength (cm) Energy (eV) Frequency (Hz)

7. Infrared... Remotes, grills, night vision and optical fibre Your skin can burn Uses Dangers 0.01 - 7 x 10 -5 0.01 - 2 3 x 10 12 – 4.3 x 10 14 Wavelength (cm) Energy (eV) Frequency (Hz)

8. Visible Waves... Helps you see and helps you use endoscopes Could cause blindness Uses Dangers 7 x 10 -5 - 4 x 10 -5 2 - 3 4.3 x 10 14 – 7.5 x 10 14 Wavelength (cm) Energy (eV) Frequency (Hz)

9. Ultraviolet Waves... Sun beds, security markers and fluorescent lamps High doses can kill cells. Low doses could be cancerous Uses Dangers 4 x 10 -5 - 10 -7 3 - 10 3 7.5 x 10 14 – 3 x 10 17 Wavelength (cm) Energy (eV) Frequency (Hz)

10. X-Ray Waves... Shadow pictures of luggage and show what's inside the human body High doses can kill cells. Low doses could be cancerous Uses Dangers 10 -7 - 10 -9 10 3 - 10 5 <3 x 10 17 – 3 x 10 19 Wavelength (cm) Energy (eV) Frequency (Hz)

11. Gamma Rays... Kills bacteria in food. Sterilises equipment. Kills cancer cells. High doses can kill cells. Low doses could cause cancer. Uses Dangers < 10 -9 > 10 5 > 3 x 10 19 Wavelength (cm) Energy (eV) Frequency (Hz)