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EM waves (1).pptx

  1. Electromagnetic Waves
  2. Submitted to : Dr. Kashif shb Submitted by: Muhammad Nadeem Roll No: bsf1800584 University of education , Lahore.
  3. Electromagnetic Waves  If you have ever tuned in to listen to a radio , a spoken headphone , turned on a light , hand on X ray taken, felt the warmth of the sun on your skin.  You have experienced ELECTROMAGNETIC WAVES.
  4. Definition  “Electromagnetic waves are the waves which do not require any medium for their propagation.  These are formed when an electric field couples with a magnetic field.  The electric and magnetic fields of an electromagnetic wave are perpendicular to each other and to the direction of waves.”
  5. How do moving charges create magnetic fields?  Any moving electric charge is surrounded by an electric field and a magnetic field.
  6. Production of E.M Waves :  when an electric charge vibrates , the electric field around it changes a magnetic field.
  7.  The electric and magnetic fields vibrate at right angles to the direction of wave travels so it is a transverse wave.
  8. What is the speed of E.M Waves ?  All E.M waves travel with speed 3*10^8 m/s  E.M waves usually travel slowest in solids and fastest in gases.
  9. Properties of E.M waves :  All the E.M waves are transverse.  they do not require any medium to travel though.  they travel at speed 3*10^8 m/s in vacuum.  they can be reflected and refracted.  they can all be emitted and absorbed by matter.
  10. Graphically Representation:
  11. Chart of wave length and frequency:
  12. What question do you have?