EM Waves
by Elliot Sitoh
1. X-ray
1.1. High frequency
1.2. Short wavelength
1.3. Produced by firing high speed electrons at metal target
1.4. Applications
1.4.1. Medical scans
1.4.2. Radiation therapy
1.4.3. Airport security
1.5. Dangerous
1.5.1. Can damage cells
1.5.2. (Can cause cancer)
2. UV rays
2.1. Obained from sunlight
2.2. Applications
2.2.1. Sun tan
2.2.2. Kills bacteria
2.2.3. Check counterfeit notes
2.3. Dangers
2.3.1. Skin not used to sun
2.3.2. Damages cells
2.3.3. Can cause cancer
3. Visible light (rays)
3.1. Red
3.2. Orange
3.3. Yellow
3.4. Green
3.5. Blue
3.6. Violet
3.7. Indigo
4. Infra-red
4.1. Emitted by hot objects
4.2. Infre-red detectors allow people to see-in-the-dark
5. Microwaves
5.1. Produced by special devices
5.2. Applications
5.2.1. Heat food
5.2.1.1. Microwaves are absorbed by water/sugar/fats
5.2.1.2. Energy from microwaves converted into heat
5.2.2. Satellite communication
6. Properties
6.1. All EM waves travel at speed of light
6.1.1. Speed = frequency*wavelength
6.1.2. Different EM waves have different wavelengths and frequency
6.2. Obey rules of reflection and refraction
6.3. Do not require a medium
6.4. Transverse
6.5. Transfer energy
7. Gamma Rays
7.1. Highest frequency
7.2. Shortest wavelength
7.3. Emitted by nucleus of radioactive atoms
7.4. Applications
7.4.1. Sterilize medical instruments
7.4.2. Kill cancerous cells (radiation therapy)
7.5. Dangerous
7.5.1. Damages cells
7.5.2. (Can cause cancer)
8. Radio waves
8.1. Lowest frequency
8.2. Longest wavelength
8.3. Applications
8.3.1. TV transmissions
8.3.2. Radio transmiddions