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LESSON 1:
Different Forms of EM Waves
WHAT IS EM
WAVE?
Electromagnetic wave (EM wave) or
electromagnetic radiation is a wave
that is created as a result of
vibrations between an electric field
and magnetic field, hence known as
‘electromagnetic wave’.
Hans Christian Oersted’s
discovery: A changing
electric field produces
magnetic field. A
changing magnetic field
is therefore produced
around a vibrating
charge.
And according to Michael
Faraday, the changing
magnetic field will
produce electric field. A
wave carries energy as it
propagates, EM wave
does the same, too.
EM waves can travel through
anything even on vacuum, meaning
they do not need any medium to
travel. They travel in a vacuum at a
speed of 3x108 m/s.
There are seven different types of
EM waves. They are arranged in a
gradual progression from the waves
of lowest frequency to highest
frequency. This arrangement of EM
waves is called electromagnetic
spectrum.
In order of increasing frequency,
the EM spectrum includes radio
waves, microwaves, infrared,
visible light, ultraviolet, X-ray,
and gamma ray
LESSON 1.pptx
LESSON 1.pptx

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LESSON 1.pptx

  • 3. Electromagnetic wave (EM wave) or electromagnetic radiation is a wave that is created as a result of vibrations between an electric field and magnetic field, hence known as ‘electromagnetic wave’.
  • 4.
  • 5.
  • 6.
  • 7. Hans Christian Oersted’s discovery: A changing electric field produces magnetic field. A changing magnetic field is therefore produced around a vibrating charge.
  • 8. And according to Michael Faraday, the changing magnetic field will produce electric field. A wave carries energy as it propagates, EM wave does the same, too.
  • 9. EM waves can travel through anything even on vacuum, meaning they do not need any medium to travel. They travel in a vacuum at a speed of 3x108 m/s.
  • 10. There are seven different types of EM waves. They are arranged in a gradual progression from the waves of lowest frequency to highest frequency. This arrangement of EM waves is called electromagnetic spectrum.
  • 11. In order of increasing frequency, the EM spectrum includes radio waves, microwaves, infrared, visible light, ultraviolet, X-ray, and gamma ray