Astronomy and the Electromagnetic Spectrum 2 1 Telescopes 3 - - PDF document

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astronomy and the electromagnetic spectrum
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Astronomy and the Electromagnetic Spectrum 2 1 Telescopes 3 - - PDF document

Sep 25, 2023 128 likes •349 views

1 Astronomy and the Electromagnetic Spectrum 2 1 Telescopes 3 Electromagnetic Waves 4 2 Electromagnetic Spectrum 5 6 3 7 8 4 Wavelength: 9 10 5 Frequency: (Video credit: NASA) 11 wavelength frequency = speed For EM waves,

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Astronomy and the Electromagnetic Spectrum

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Telescopes

Electromagnetic Waves

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Electromagnetic Spectrum

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Wavelength:

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Frequency:

(Video credit: NASA)

wavelength × frequency = speed

  • For EM waves, speed = 3 × 108 m/s = 300,000 km/s

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wavelength × frequency = speed wavelength = speed frequency

  • Wavelength and frequency are inversely proportional,

as one grows, the other shrinks.

  • Also, the energy of the wave is proportional to the

frequency → higher frequency, higher energy

(Video credit: NASA)

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  • Frequency of EM waves from space primarily depend
  • n the temperature of an object.
  • Frequency is doppler shifted depending on whether
  • bject is moving towards or away from us, and how

fast.

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  • Frequency of EM waves from space primarily depend
  • n the temperature of an object.
  • Also, different frequencies can tell us about different

processes.

  • For Example:
  • UV and visible from electron transitions in atoms
  • infrared from vibrations of molecules
  • x-rays and gamma rays from high energy electrons in

magnetic fields

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Astronomy and the Electromagnetic Spectrum

Multiwavelength Astronomy

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The Crab Nebula

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Hubble Space Telescope The Crab Nebula (Hubble Telescope)

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Atomic Emission Spectrum Oxygen

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Sulfur The Crab Nebula (Hubble Telescope)

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X-Ray Image (Chandra) Neutron Star

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X-Ray Image (Chandra)

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Infrared Image Visible Image

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Radio Image Ultraviolet Image

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The Crab Nebula (Multiwavelength Composite Image)

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