Does EM radiation from cold hydrogen gas travel at light speed?

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bluemoonKY
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Does electromagnetic radiation emitted by cold hydrogen gas travel at the speed of light?
 
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Yes. The speed of light is the speed of light. It doesn't matter where the light came from.
 
bluemoonKY said:
Does electromagnetic radiation emitted by cold hydrogen gas travel at the speed of light?

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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