The electromagnetic (EM) spectrum
- Created by: emews
- Created on: 05-11-17 15:14
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- The electromagnetic (EM) spectrum
- The electromagnetic spectrum is a continuous range of wavelengths.
- The types of radiation that occur in different parts of the spectrum have different uses and dangers - depending on their wavelength and frequency.
- Types of waves
- Radio waves
- Microwaves
- Microwave radiation can be used to transmit signals, such as those for mobile phone calls.
- Infared
- Visible light
- ultraviolet
- Ultraviolet radiation - UV - is found naturally in sunlight.
- x-rays
- Gamma radiation
- White light can be split up to form a spectrum using a prism.
- The light waves are refracted as they enter and leave the prism.
- As a result, red light is refracted the least and violet light is refracted the most
- Hazards
- microwaves cause internal heating of body tissues
- infrared radiation is felt as heat and causes skin to burn
- X-rays damage cells causing mutations (which may lead to cancer) and cell death.
- gamma rays also damage cells causing mutations and cell death
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