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Speed of electromagnetic radiation

  1. Jan 31, 2016 #1
    Does electromagnetic radiation emitted by cold hydrogen gas travel at the speed of light?
  2. jcsd
  3. Jan 31, 2016 #2

    Vanadium 50

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    Yes. The speed of light is the speed of light. It doesn't matter where the light came from.
  4. Jan 31, 2016 #3


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    All kinds of electromagnetic radiation travel at the same speed. Light is electromagnetic radiation just like radio waves, microwaves, IR, UV, X-rays and gamma radiation.
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