1. Effects
1.1. Absorbing lower frequencies
1.1.1. Heating effect on cells and tissues
1.2. Absorbing higher frequencies
1.2.1. Ionisation of cells and tissues, altering DNA, cells and tissues
2. Properties
2.1. All travel at 3x10^8m/s in vacuum
2.2. Obey the Laws of Relfection and Refraction
2.3. May transfer energy from 1 place to another
2.4. All are transverse waves
2.5. All obey the equation speed=frequency x wavelength
3. Types
3.1. Radiowaves
3.1.1. elections ocsillating in a electical circuit
3.1.2. used for TV and radio transmissions
3.2. Gamma ray
3.2.1. emmited from the nucleus of a radioactive atom
3.2.2. sterilize medical equipment and kill cancerous cells
3.3. X rays
3.3.1. firing electrons at high speeds at a metal target
3.3.2. use to produce the image of a bone structure
3.4. Ultra-violet rays
3.4.1. obtained from sunlight
3.4.2. use to suntan, kill bacteria and check for counterfeit notes
3.5. Visible light
3.5.1. contains the colours of the spectrum
3.5.2. use to see
3.6. Infra-red rays
3.6.1. emmitted from hot objects
3.6.2. infra-red detector can detect infra-red into visible image
3.7. Microwaves
3.7.1. produced by special electronic devices
3.7.2. used to heat up food and satellite communication