Transcript Radio Waves
QuickTime™ and a decompressor are needed to see this picture. Joie Tsang Caroline Nunberg Sarah Sylvia The name of our “speck” of the EM spectrum is Radio Wave. • Radio waves have wavelength between 100,000 meters and 0.001 meters. FREQUENCY • Radio waves have a range of frequency between 3 KHz and 300 GHz. Where does is fit in the spectrum? • Radio waves are at the top of the electromagnetic spectrum. • This speck is right above microwaves. Uses and Applications for This Type of Energy COMMUNICATION Cell Phones • System of separated zones called “cells”. • Each cell has a base station that receives and sends out radio waves. QuickTime™ and a decompressor are needed to see this picture. Placing a Call • A signal is sent from the cell phone antenna to it’s base station antenna. • The base assigns the phone to a radio frequency channel. • The set radio signals are simultaneously received and sent. • The base station transfers the call so it reaches another phone. Television QuickTime™ and a decompressor are needed to see this picture. • For cable, the radio frequency signals are transmitted through the fixed optical fibers • For traditional TV broadcasting it is done through radio waves that requires an antenna. • The antenna receives the picture and puts it on your screen. QuickTime™ and a decompressor are needed to see this picture. • The transmitter at the radio station has converted the sound waves into electromagnetic waves. • They are put into electromagnetic waves in the radio in the radio frequency range. • The radio receives the radio waves, decodes the info, and the speaker changes it to a sound wave. Remote Control Toys • Transmitter- the controller – Sends radio waves to the receiver • Receiver- antenna and circuit board inside the toy – Receives the radio wave signals and activates the motors in the toy. Quic kTime™ and a dec ompres s or are needed to s ee this pic tur e. Submarines • Submarines can receive very or extremely low frequency radio waves. • They travel through the water and reach the submarine. • This allows communication to the outside world. Quic kTime™ and a dec ompr es sor are needed to s ee this pic ture. Are Humans and Other Organisms able too see radio waves? • No, radio waves are an invisible form of electromagnetic radiation. • Radio waves travel through air and space in a straight line. • They can travel through solid objects like buildings or people- unlike light waves. Is This Damaging to Humans? • There is no evidence that it is harmful. • Large doses of radio waves are believed to cause cancer, leukemia, and other disorders (only in children). • One man cured his wife’s cancer using radio waves. This Is What He Did • John Kanzius cured his wife’s cancer using a pie pan and hot dogs. • He gave a little shock, and it killed the cancer cells. QuickTime™ and a decompressor are needed to see this picture. QuickTime™ and a decompressor are needed to see this picture. “One box sends radio waves over to the other, creating enough energy to activate gas in a fluorescent light. [He] put his hand in the field to demonstrate that waves are harmless to humans.” He injected the hot dog with sulfate and took the probe right at the injection site. When the shock was given, it killed the cancer cells. Discovery! QuickTime™ and a decompressor are needed to see this picture. • Heinrich Hertz - 1888 • Worked with Maxwell- proposed equations • Produced electromagnetic waves – Measured the velocity and wavelength Radio waves can be as big as a football field or as small as a football. Naturally produced radio waves are produced by lightening, sparks, and stars. This is why you hear interference on your radio during a storm. QuickTime™ and a decompressor are needed to see this picture. 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