Plank Time & Speed: Is Light C Plank Speed?

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SUMMARY

The discussion centers on the relationship between Planck time, Planck length, and the speed of light (c). It establishes that Planck time is defined as the time it takes for a photon to travel a Planck length, leading to the conclusion that the speed of light can be viewed as Planck speed. The conversation emphasizes that both Planck time and Planck length are defined in relation to fundamental constants, including c, and suggests that these definitions do not constitute evidence but rather a framework for understanding physical units.

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  • Understanding of Planck time and Planck length
  • Familiarity with the speed of light as a physical constant
  • Basic knowledge of fundamental constants in physics
  • Concept of dimensional analysis in physics
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  • Research the definitions and implications of Planck time and Planck length
  • Explore the concept of physical constants and their role in defining units
  • Study dimensional analysis and its applications in physics
  • Investigate the implications of setting c and Planck units to 1 in theoretical frameworks
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Physicists, students of theoretical physics, and anyone interested in the foundational concepts of quantum mechanics and the nature of physical constants.

brianhurren
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If plank time is the time it takes a photon to travel a plank length and speed is d/t or meters/second. then is the speed of light c plank speed? is the constant speed of light evidence of plank time?
 
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Yep, I guess.

Note however, that the speed of light is a physical constant and in fact the meter is defined in terms of it. A unit like the Planck time and Plank length are also defined in terms of other fundamental constants, e.g. t_\mathrm{P} = \ell_\mathrm{P} / c where \ell_\mathrm{P} = \sqrt{\hbar G c^{-3}} is defined in terms of c and two other fundamental constants. So it's basically by construction, which I wouldn't call "evidence".
 
brianhurren said:
evidence of plank time?
What does that mean? Do you need evidence of ounces, or teaspoons? What does it mean to have evidence of a unit?
 
Meter is a definition, second is. (Teaspoons also). So it is better to set c as 1. And lp as 1.

Sincerely.
 

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