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Electromagnetic radiation

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Intro to Astronomy

Definition

Electromagnetic radiation is energy that travels through space in the form of waves. It includes a wide range of wavelengths, from gamma rays to radio waves.

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5 Must Know Facts For Your Next Test

  1. Electromagnetic radiation can be described by its wavelength, frequency, and energy.
  2. The speed of light (approximately 300,000 km/s) is constant for all forms of electromagnetic radiation in a vacuum.
  3. Visible light is only a small part of the entire electromagnetic spectrum.
  4. Different types of electromagnetic radiation are used for various astronomical observations, such as X-rays for high-energy processes and radio waves for studying cosmic microwave background radiation.
  5. The behavior and interaction of electromagnetic radiation with matter are fundamental to understanding astronomical phenomena.

Review Questions

  • What determines the different types of electromagnetic radiation?
  • Why is the speed of light important in the study of electromagnetic radiation?
  • How does visible light compare to other forms of electromagnetic radiation?
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