Does anything travel at speed c in the atmosphere.

  • Thread starter jonathang
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  • #1
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I understand the electromagnetic spectrum travels below speed c in Earth’s atmosphere. Is there any part of the spectrum which remains at speed c, or indeed anything which travels at speed c in the atmosphere?

Thanks
 

Answers and Replies

  • #2
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The atmospheric effect on the speed of electromagnetic radiation becomes more and more negligible the higher the energy of the incoming photon. gamma rays will travel very close to c through the atmosphere.
 
  • #3
Claude Bile
Science Advisor
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Most portions of the EM spectrum have a phase velocity in excess of c.

Some portions I suspect have a group velocity in excess of c, but are highly absorbing at these wavelengths - so you ultimately cannot trasmit information faster than c.

Claude.
 

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