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  • الانزلاق: 1
  • good afternoon class, so today were going to talk about scientist and their contribution to the EM waves
  • الانزلاق: 2
  • Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are composed of oscillating magnetic and electric fields.
  • Sir, may I ask what is EM waves?
  • Now, let's start our topic
  • الانزلاق: 3
  • About 150 years ago,James Clerk Maxwell, an English scientist, developed a scientific theory to explain electromagnetic waves.He noticed that electrical fields and magnetic fields can couple together to form electromagnetic waves.
  • الانزلاق: 4
  • Sir, how about Heinrich Hertz?
  • الانزلاق: 5
  • Heinrich Hertz, a German physicist, applied Maxwell's theories to the production and reception of radio waves. The unit of frequency of a radio wave -- one cycle per second -- is named the hertz, in honor of Heinrich Hertz.
  • With this oscillator, Hertz solved two problems. First, timing Maxwell's waves. He had demonstrated, in the concrete, what Maxwell had only theorized - that the velocity of radio waves was equal to the velocity of light! (This proved that radio waves were a form of light!) Second, Hertz found out how to make the electric and magnetic fields detach themselves from wires and go free as Maxwell's waves.
  • الانزلاق: 6
  • Neither an electrical field (like the static which forms when you rub your feet on a carpet), nor a magnetic field (like the one that holds a magnet onto your refrigerator) will go anywhere by themselves. But, Maxwell discovered that a CHANGING magnetic field will induce a CHANGING electric field and vice-versa.
  • That's for today. Goodbye class we will have short quiz tomorrow
  • Goodbye sir, see you tomorrow
  • الانزلاق: 0
  • Hertz proved the existence of radio waves in the late 1880s. He used two rods to serve as a receiver and a spark gap as the receiving antennae. Where the waves were picked up, a spark would jump. Hertz showed in his experiments that these signals possessed all of the properties of electromagnetic waves.
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