Applications of electromagnetic radiation
Applications of electromagnetic radiation1. Radio waves – they are used in radio, TV and cellular mobile communications.-Used in military communications (satellite imagery) to form an image of the ground even when there are clouds.2. Microwaves - used in radar communications by giving direction and distance.-Used in speed guns by the police to detect over speeding.-Used in microwave ovens to warm food. The food becomes warm by absorbing energy.-Used reliably for communication (telephone and computer data).3. Infra-red radiation - used to produce images of hot objects through the colours-Produced by the amount of heat dissipated by an object.-Images produced by satellites give important information on vegetation cover in all areas of the globe. They can also detect fires.-They are used in hospitals to detect illnesses (diagnosis)-Used in warfare missiles and burglar alarm systems-Used in green houses to grow crops4. Visible light - used by plants in remote sensing and humans in the identification of things-Used by plants in the process of photosynthesis5. Ultra-violet (UV) radiation – used to make reflective materials which absorb light and re-emit it as visible light.-Used in banks to detect fake currency6. X-rays - used in hospitals to detect fractures, broken bones and in treatment of cancer (radiotherapy).-Used to detect foreign materials in the body i.e. metals-Used to detect invisible cracks in metal castings and welding joints7. Gamma rays - used to sterilize medical instruments-Used to kill weevils in grain-Used to take photographs same way like X-rays.