Electromagnetic radiation

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3.5

• Electromagnetic radiation

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Wave diagram
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Electromagnetic radiation

• radiation travels in waves
• Wavelength (?) distance between 2 waves
• Measured in meters (m)
• Frequency number of waves to pass a point in 1
  second.
• Measured in cycles per second (1/s) (s-1) or
  hertz (hz)

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Electromagnetic radiation

• longer waves have low frequency
• (radio, tv)
• shorter waves have high frequency
• (UV, x-rays)

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Calculating wavelength, frequency.

• c speed of light
• 3.0 x 108 m/s
• ? wavelength (m)
• v frequency (1/s)

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Calculating wavelength

• What is the wavelength of electromagnetic
  radiation with a frequency of 1x106 s-1 ?
• Calculate the wavelength of electromagnetic
  radiation with a frequency of 1x 1019 hz ?

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Light

• A narrow range of electromagnetic radiation.
• Wavelengths 400 x 10 -9m ? 700 x 10 -9m
• (400 nanometers? 700 nanometers)

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Determining Wavelength ?

• ? c/ v cspeed of light vfrequency ?
  wavelength
• Wavelength speed of light divided by the
  frequency
• Speed of light is 3.00 x 108 m/s

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? c/? Problems

• Calculate the frequency (?) of a wave with a
  wavelength (?) of
• 1.5 x 10-3 m

• Calculate the wavelength(?) of a wave with a
  frequency of
• 4.0 x 10 5 1/s