electromagnetic spectrum
TRANSCRIPT
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The Electromagnetic Spectrum
(A study of the production & detection of EM waves, & discussion of the different regions of the
electromagnetic spectrum.)
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PRODUCING ELECTROMAGNETIC
WAVES
Part 1
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Producing Electromagnetic Waves
James Clerk Maxwell
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He was a Scottish physicist,
distinguished for his contributions
to the electromagnetic theory of
light and the kinetic theory of
gases
Producing Electromagnetic Waves
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Maxwell’s electromagnetic equations
states that an oscillating electric current
should be capable of radiating energy in the
form of a wave known as electromagnetic
waves (EM waves) that would travel as fast
as the speed of light.
Producing Electromagnetic Waves
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Producing Electromagnetic Waves
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Producing Electromagnetic Waves
Heinrich Hertz
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discovered Hertzian wave – an
electromagnetic radiation produced
by electrical oscillation in a
conductor, of wavelengths ranging
from the order of millimetres to
kilometres.
Producing Electromagnetic Waves
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Producing Electromagnetic Waves
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Producing Electromagnetic Waves
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Producing Electromagnetic Waves
Propagation of EM waves
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How Electromagnetic Waves are Created
An EM wave used for communication
purposes is made by using a coil and a
capacitor in a parallel circuit.
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How Electromagnetic Waves are Created
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How Electromagnetic Waves are Created
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How Electromagnetic Waves are Created
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How Electromagnetic Waves are Created
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How Electromagnetic Waves are Created
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THE ELECTROMAGNETIC
SPECTRUM
Part 2
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Radio and TV waves
are waves that have the longest
wavelengths and the lowest frequencies
in the electromagnetic spectrum. They
can be produced by making electricity
oscillate in an aerial.
The Electromagnetic Spectrum
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The Electromagnetic Spectrum
Microwaves
are radio waves of very short
wavelengths. They are used in satellite
communications, radar, mobile phone
networks and for cooking.
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The Electromagnetic Spectrum
Infrared waves
are waves that lie in the region
beyond the red end of the visible
spectrum. Its wavelength is too long to
be visible to the naked eye.
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The Electromagnetic Spectrum
Visible wavesare waves that are visible to
the naked eye; also known as
light waves.
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The Electromagnetic Spectrum
Ultraviolet wavesare invisible radiations that lie
beyond the violet end of the visible
spectrum. It has a shorter
wavelength than violet light.
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The Electromagnetic Spectrum
X-rays
an electromagnetic radiation in the
wavelength range 0.1-100 Å produced by
the rapid acceleration of electrons in X-ray
machines that collide with atoms; have
short wavelength and high frequencies and
are very penetrating.
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The Electromagnetic Spectrum
Gamma raysare high energy waves produced
from nuclear reaction; the most
penetrating radiant nuclear energy
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THE END