Electromagnetic Waves
da Benedict Liew
1. Obey the formula : Speed = Frequency x Wavelength
2. Ultra-violet rays
2.1. Can be obtained from sunlight.
2.2. Produces suntan.
2.3. Kills bacteria
2.4. Used to check counterfeit notes.
2.5. Can be dangerous when exposed excessively
3. Visible light
3.1. Encompasses all the colours of the spectrum.
3.1.1. Red
3.1.2. Yellow
3.1.3. Orange
3.1.4. Green
3.1.5. Blue
3.1.6. Violet
3.1.7. Indigo
3.2. To allow living creatures to see.
4. Properties
4.1. Travel at the speed of light.
4.1.1. Session Rule 1
4.1.2. Session Rule 2
4.2. Obey laws of reflection and refraction.
4.3. Transfer energy from one place to another.
4.4. Are transverse waves.
5. Infra-red rays
5.1. Emitted by hot objects.
5.2. Used in infrared detectors that convert the infrared into a visible image.
5.3. Used in night vision technologies.
5.3.1. Image enhancement
5.3.2. Thermal imaging.
6. Lower frequencies.
7. Higher frequencies.
7.1. Can cause ionization of cells and tissues which knocks off electrons from atoms, producing ions and free radicals that can damage DNA, cells and tissues.
8. Can cause a heating effect on cells and tissues when absorbed.
9. Gamma rays
9.1. Emitted by the nucleus of the radioactive atoms.
9.2. Used to sterilize medical instruments.
9.3. Kill cancerous cells.
9.4. Highly energetic and can do considerable damage to living cells.
10. X - Rays
10.1. Produced by firing high speed electrons at a metal target.
10.1.1. Sub Idea 1
10.1.2. Sub Idea 2