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# Electromagnetic waves

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Electromagnetic waves

Electromagnetic waves

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• 1. COMPILED By RIA TALWAR XII- SCIENCE (2011-12) FAITH ACADEMY
• 2. Water and sound waves transfer energy fromone place to another- they require a mediumthrough which to travel. They are mechanicalwaves.Electric field-region in which charged particlescan be pushed or pulled.
• 3. Nature of Electromagnetic Waves They are Transverse waves without a medium. (They can travel through empty space) They travel as vibrations in electrical and magnetic fields. Have some magnetic and some electrical properties to them. Speed of electromagnetic waves = 300,000,000 meters/second (Takes light 8 minutes to move from the sun to earth {150 million miles} at this speed.)
• 4.  When an electric field changes, so does the magnetic field. The changing magnetic field causes the electric field to change. When one field vibrates—so does the other. RESULT-An electromagnetic wave. Click here Animation: Interaction of vibrating charges
• 5. Waves or Particles Electromagnetic radiation has properties of waves but also can be thought of as a stream of particles. Example: Light Light as a wave: Light behaves as a transverse wave which we can filter using polarized lenses. Light as particles (photons) When directed at a substance light can knock electrons off of a substance (Photoelectric effect)
• 6. B.Electromagnetic Spectrum—name for the range of Waves of the Electromagnetic Spectrum electromagnetic waves when placed in order of increasing frequency Click here (Animation—Size of EMwaves) ULTRAVIOLET GAMMA RADIO INFRARED RAYS RAYS WAVES RAYS MICROWAVES X-RAYS VISIBLE LIGHT
• 7. RADIO WAVES A. Have the longest wavelengths and lowest frequencies of all the electromagnetic waves. B. A radio picks up radio waves through an antenna and converts it to sound waves. C. Each radio station in an area broadcasts at a different frequency. # on radio dial tells frequency. D. MRI (MAGNETIC RESONACE IMAGING)  Uses Short wave radio waves with a magnet to create an image
• 8. AM=Amplitude modulation—waves bounce off ionosphere canpick up stations from different cities.(535kHz-1605kHz= vibrate at 535 to 1605 thousand times/second) +
• 9. FM=Frequency modulation—waves travel in a straight line &through the ionosphere--lose reception when you travel out of range.(88MHz-108MHz = vibrate at 88million to 108million times/second) +