Electromagnetic Spectrum

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Electromagnetic Spectrum
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What is the EM Spectrum?

• All the Types of Radiation we receive from the
  sun and other sources, including visible light
• Radiation is energy
• How does energy travel?
• In Waves!!!

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WAVELENGTH is just as it sounds..The LENGTH of
a WAVE
WAVES Wavelength and Frequency
FREQUENCY is how many waves per second
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Wavelength and the EM Spectrum
The different wavelengths of the EM spectrum
correspond to the different types of waves and
the different energies that each has
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Visible light is a small part of the EM Spectrum
Ranges from about 400-700 nm
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Visible Light and The EM Spectrum
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The Colors of Visible Light ROYGBV

• 380-440 nm wavelength of violet light
• 440-520 nm wavelength of blue light
• 520-565 nm wavelength of green light
• 565-590 nm wavelength of yellow light
• 590-625 nm wavelength of orange light
• 625-740 nm wavelength of red light

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All objects give off some form of radiation

• It may take millions or even billions of years to
  get here
• The different types of radiation differ in
  wavelength, frequency, and energy
• Some forms may be too weak for us to be able to
  detect
• Radio waves are a good source of radiation that
  we can study

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Wave Type Wavelength (Size) Frequency (How many) Energy (EV)
RADIO WAVE 102 m (soccer field) 106 per second 10-9 EV
MICROWAVE 10-1 m (baseball) 109 per second 10-5 EV
INFRARED 10-5 m (cell) 1013 per second 10-1 EV
VISIBLE LIGHT 10-6 m (bacteria) 1014 per second 1 EV
ULTRAVIOLET LIGHT 10-7 m (virus) 1015 per second 101 EV
X-RAYS 10-8 10-11 m (water molecule) 1016 1019 per second Up to 105 EV
GAMMA RAYS Less than 10-11 m (atoms) Over 1020 per second Over 106 EV
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• Things to Know / Study for your upcoming quiz
• How long ago did the Big Bang happen and how long
  ago was the earth created? How do we know this?
• What is the evidence for the Big Bang?
• How do we know the Universe is expanding What
  is the evidence?
• How do we gather data about the age and
  composition of astronomical objects?