Unraveling the Mystery of E=mc2: Speed of Light

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SUMMARY

The discussion clarifies that in the equation E=mc², the constant "c" specifically refers to the speed of light in a vacuum, which is 299,792,458 meters per second. Participants emphasized that while the speed of light can vary in different media such as air or glass, scientific applications of this equation consistently utilize the vacuum speed of light to avoid confusion. This distinction is crucial for accurate calculations in physics and ensures consistency across scientific disciplines.

PREREQUISITES
  • Understanding of Einstein's mass-energy equivalence principle
  • Familiarity with the concept of the speed of light
  • Basic knowledge of physics terminology
  • Awareness of light propagation in different media
NEXT STEPS
  • Research the implications of E=mc² in modern physics
  • Explore the differences between the speed of light in a vacuum and in various media
  • Study the applications of mass-energy equivalence in nuclear physics
  • Learn about the historical context of Einstein's theories and their impact on contemporary science
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Students, educators, and professionals in physics, particularly those interested in theoretical physics and the principles of relativity.

ANO94
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i know this might be a dumb question but it was in my head and i would love to hear an answer,

so the famous E=mc2..e obviously energy, m mass, c is the speed of light,
but what speed of light? we all know that c is constant at vacuum but it changes when it goes through another medium like air or glass or whatever it is, so my question was when scientists actually apply this equation...what c do they use? like do they use c of air for example or d they only use the normal c which is 299,792,458 metres per second?
 
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"c" always refers to "speed of light in a vacuum"
so there's no confusion here.
 

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