1. Radio Waves Used for communications Energy: Low energy Wavelength: a few cm to a few km Frequency: 10 2 Hz to 10 8 Hz Dangerousness: Not dangerous

2. Microwaves Used for communications & heating food Energy: Low energy Wavelength: 0.1 cm to 10 cm Frequency: 10 9 Hz to 10 11 Hz Dangerousness: Low risk

3. Infrared Waves Used in remote controls, to heat things and used to detect people & fires Energy: Moderate energy Wavelength: 0.0007 mm to 0.003 mm Frequency: 10 12 Hz to 10 14 Hz Dangerousness: Some risk (Can burn)

4. Visible Light Used to see, measure things & photography Energy: Moderate energy Wavelength: 0.0004mm to 0.0007 mm Frequency: 10 15 Hz Dangerousness: Not dangerous

5. Ultraviolet Light Used in sunbeds, to kill bacteria and in security marking Energy: Moderate energy Wavelength: 0.00001mm to 0.0004 mm Frequency: 10 16 Hz Dangerousness: Fairly (burns skin & eyes)

6. X Rays Used to see through things Energy: High energy Wavelength: 10 -10 m Frequency: 10 18 Hz Dangerousness: Very (High dose burns, causes cancer)

7. Gamma Rays Used in medical treatment & to sterilise things Energy: High energy Wavelength: 10 -14 m Frequency: 10 20 Hz Dangerousness: Very (High dose burns, causes cancer)