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The receiver first uses a bandpass filter to separate the desired radio station's radio signal from all the other radio signals picked up by the antenna, then amplifies the signal so it is stronger, then finally extracts the information-bearing modulation signal in a demodulator. Introduction to RF Propagation. The oscillating radio signal from the desired station causes the tuned circuit to oscillate in sympathy, and it passes the signal on to the rest of the receiver. The modulated carrier is amplified and applied to an antenna. Different frequencies experience different combinations of these phenomena in the Earth's atmosphere, making certain radio bands more useful for specific purposes than others. However, unlike infrared waves, which are mainly absorbed at the surface of objects and cause surface heating, radio waves are able to penetrate the surface and deposit their energy inside materials and biological tissues. The oscillating current pushes the electrons in the antenna back and forth, creating oscillating electric and magnetic fields , which radiate the energy away from the antenna as radio waves. They are generated by electric charges undergoing acceleration , such as time varying electric currents. In other projects Wikimedia Commons. Radiation syndrome acute chronic Health physics Dosimetry Electromagnetic radiation and health Laser safety Lasers and aviation safety Medical radiography Mobile phone radiation and health Radiation protection Radiation therapy Radioactivity in the life sciences Radioactive contamination Radiobiology Biological dose units and quantities Wireless electronic devices and health Radiation Heat-transfer. A Guide for Designers and Installers. Retrieved 11 Sep Radio Regulations PDF.

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Description: Air is thin enough that in the Earth's atmosphere radio waves travel very close to the speed of light. His mathematical theory, now called Maxwell's equations , described light waves and radio waves as waves of electromagnetism that travel in space, radiated by a charged particle as it undergoes acceleration. The radio waves carry the information to the receiver location. Radio waves passing through different environments experience reflection , refraction , polarization , diffraction , and absorption. Introduction to RF Propagation. For the British broadcasting station, see Radio Wave. The oscillating radio signal from the desired station causes the tuned circuit to oscillate in sympathy, and it passes the signal on to the rest of the receiver. Views Read Edit View history. More recently they have been used to create higher temperatures in hyperthermia treatment and to kill cancer cells. Electromagnetic spectrum. Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. A strong enough beam of radio waves can penetrate the eye and heat the lens enough to cause cataracts. Radio signals at other frequencies are blocked by the tuned circuit and not passed on.

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