If all particles were different sizes, would the speed of light stay the same

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SUMMARY

The speed of light, denoted as "c," remains constant at approximately 299,792 kilometers per second in a vacuum, regardless of the size of photons. The discussion emphasizes that while photons can theoretically have wavelengths comparable to galaxies, their speed remains unchanged. Other particles, such as those with mass, travel slower than the speed of light, while gluons do not propagate freely and therefore lack a defined speed. The fundamental nature of light ensures that all electromagnetic radiation travels at c in a vacuum.

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  • Understanding of electromagnetic radiation and its properties
  • Basic knowledge of particle physics, including photons and gluons
  • Familiarity with the concept of speed in physics
  • Comprehension of the principles of relativity
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  • Explore the concept of wavelength in relation to photon behavior
  • Study the principles of special relativity and their impact on light speed
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KarminValso1724
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For example, if photons were the size of galaxies, would they still move at the speed of light?
 
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The concept of "size" is ambiguous for particles. Photons can in principle have wavelength the size of a galaxy, and it still moves at the speed of light.
Other particles, except gluons, have mass so they travel slower than the speed of light. Gluons can't propagate freely, so don't have a speed.
 
KarminValso1724 said:
For example, if photons were the size of galaxies, would they still move at the speed of light?

How were you able to measure the size of a photon in the first place?

ALL light/EM radiation, by definition, travels at c in vacuum.

Zz.
 
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