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Download Uses of EM Waves
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Click here for an interactive EM spectrum [http://imagers.gsfc.nasa.gov/ems/ircat.gif] Types of EM Waves • Radio Waves • AM and FM Radio • Radar – Radio Detecting and Ranging • MRI – Magnetic Resonance Imaging Click here for a Radar animation [http://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Radio_transmition_diagram_en.png/800pxRadio_transmition_diagram_en.png] Types of EM Waves • Microwaves • Microwave Ovens heat food by vibrating water molecules. • Satellite Communications and GPS systems • Cell Phones Click here for cell phone SAR ratings Types of EM Waves • Infrared Waves • These carry thermal energy (heat) • Thermal Photographs [http://www.thermal-imaging-survey.co.uk/archive/images/buildi1.jpg] Thermal Imaging shows infrared waves… Night Vision amplifies available light waves… [http://www.extremecctv.com/images/producttype/ThermalIR-vs-ActiveIR.pdf] Types of EM Waves • Visible Light • The only EM wave humans can see, it produces the colors around us. Types of EM Waves • Ultraviolet Waves • Can cause sunburn and skin cancer, but also needed for skin to produce Vitamin D. • Can kill bacteria. Types of EM Waves • X-Rays • Can travel through soft tissue, but are stopped by bones to make medical “X-Rays” • Airports to inspect luggage. [http://www.physiciansfirstinc.com/handsx.gif] Types of EM Waves • Gamma Rays • Ultra-High frequency waves that can break molecular bonds. • Radiation therapy can kill diseased cells, but if not controlled can also kill healthy cells.
