PPT-Radio Waves

Used for communications Energy Low energy Wavelength a few cm to a few km Frequency 10 2 Hz to 10 8 Hz Dangerousness Not dangerous Microwaves Used for communications amp heating food . ELECTROMAGNETIC SPECTRUM. Training of Trainers for Grade 10 of the K to 12 Enhanced Basic Education Program. April 27 – May 2, 2015 . (Luzon Cluster). Spiraling of concepts. Module 2 Competencies. Module 2 activities. There’s a whole lot of light out there!. The Electromagnetic Spectrum. The electro-magnetic spectrum is made up of visible and . nonvisible. light.. Electromagnetic waves are produced by stars and galaxies.. RADAR. By Tony Kim and Ross Chu. Block D. Physics. RADAR which stands for . RAdio. Detection And Ranging was developed by Britain in the late 1930’s, during WW2. Before the war, Radars were used to detect objects through the usage of radio waves. Doppler Effect. ~apparent change in frequency of a wave due to the motion of the source of the wave.. If the object is moving towards the observer the frequency will appear to increase. If the object is moving away from the observer the frequency will appear to decrease. Alex Hills. Chapter 27. Summary. Communication engineer Alex Hills explains how the satellite communications systems he designed for rural Alaskans helped him develop Wi-Fi system. Because of tough terrain, laying telephone wire was not feasible, and shortwave radio signals often met interference from the Northern Lights. Alex helped devise a communications system using satellite technologies that allowed rural Alaskans to communicate across the tundra. Eventually, Hills was instrumental in linking the state’s university campuses together via satellite. The wireless network inspired Hills to develop the first Wi-Fi at Carnegie Mellon University in the 90’s.. Electromagnetic Radiation. Electromagnetic waves perpendicular waves combing the electric and magnetic fields. . Electromagnetic waves are produced when an electric charge vibrates or accelerates and can travel through empty space or through matter. . Seismic . Waves. . are shock . waves . given off by earthquakes. . There are 2 types:. 1. . Body Waves. . originate from the . focus. (. F. ). travel . through. . the earth. . They’re used to locate . Waves!. Play Multimedia. Outline. Wave Basics. Electromagnetic . Spectrum . Tour. Radio Detection . And . Ranging (Radar). SAR vs. ISAR. Applications in Geometry. Rise to the challenge. Wave Basics. A . Before the waves are made the particles are same distance apart. While waves moves through the medium the particles . compress. together, then they spread further apart (stretched areas)- . rarefaction.. Gravitational Wave Bonus). The next slides show images of the SAME region of sky, but using different types of light. The view in VISIBLE LIGHT. INFRARED. RADIO WAVES. RADIO WAVES. GAMMA RAYS. Different types of light give us different information!. Wave. Repeating disturbance or movement. Carries energy through matter and space. Vibrations. Anything that moves in a rhythmic patter. Up and down. Back and forth. What is a Wave. All waves are produced when something vibrates. Mechanical Waves. A mechanical wave is created when a source of energy causes a vibration to travel through a medium.. A mechanical wave is a disturbance in matter that carries energy from one place to another.. Earthquakes-Tsunamis. Graviational. attraction-Tides. Wind waves move energy, not matter. Wind waves- Growth. Wind strength- must be moving faster than waves. Wind duration-longer creates larger waves. Each station has a different remit, content, style and target audience. . The BBC has delivered radio since the 1920s as part of . Public Service Broadcasting . (PSB). The Reithian concept of the BBC was to raise the cultural standards of the nation so it resisted playing solely popular music until 1967, when Radio 1 was born..