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Energy in Our Life
Miroslav Hruška Czech Republic
Electromagnetic radiation …is a form of ENERGY
Forms of E-M radiation radio waves microwaves infrared radiation visible radiation (light) ultraviolet radiation X-rays gamma rays
Electromagnetic waves wavelength - in metres frequency - in hertz
Wave formula wave speed = = frequency x wavelength c = 300,000,000 m/s the higher frequency the lower wavelength
Differences in sources in penetrability in impact on people in use
Microwaves - oven
Microwaves - communication
Microwaves - radar
Thermal radiation infrared radiation visible radiation = light ultraviolet radiation
Thermal radiation - sources Sun and other stars light bulb hot oven infrared heater melting iron hot lava
Thermal radiation formula The hotter a body is, the shorter wavelengths it emits, and the more energy it looses.
Infrared radiation - use thermography night vision infrared heating remote control
Infrared radiation - thermography
Infrared radiation – night vision
Light from 390 nm to 790 nm
Light spectrum prism spectrum
Light - spectroscopy spectral analysis => chemical composition
Laser Light Amplification by Stimulated Emission of Radiation
Laser – optical recording CDred laser 780 nm DVDred-orange 650 nm Blu-ray“blue” (violet) 405 nm
UV radiation UVA nm UVB nm UVC nm
Gamma rays – in medicine
Electromagnetic radiation © Miroslav Hruška, 2012
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