Planck's Constant Related to Velocity of Light?

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Discussion Overview

The discussion revolves around the relationship between Planck's constant and the velocity of light, particularly in the context of quantum mechanics and special relativity. Participants explore various formulas and experimental methods for calculating Planck's constant, questioning whether these constants are fundamentally related or independent.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that the finiteness of the velocity of light and the non-zero value of Planck's constant indicate a fundamental relationship between quantum mechanics and special relativity.
  • Another participant requests examples of formulas that involve dividing Planck's constant by the velocity of light.
  • A participant shares a PDF detailing how to measure Planck's constant from LEDs, questioning if this implies an inverse relationship between h and c.
  • In response, one participant asserts that h and c are independent fundamental constants, arguing that the presence of constants in equations does not imply interdependence.
  • Another participant clarifies that the inclusion of c in the calculation is due to using the wavelength of light, suggesting that if frequency were used instead, c would not appear.

Areas of Agreement / Disagreement

Participants express differing views on whether Planck's constant and the velocity of light are related. Some propose a connection, while others argue for their independence, indicating that the discussion remains unresolved.

Contextual Notes

Participants reference specific equations and experimental setups without providing complete derivations or assumptions, leaving some mathematical steps and dependencies unclear.

LarryS
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A few of the formulas that I have seen for calculating Planck's constant involve, amoung other things, dividing by the velocity of light. It appears as though the finiteness of the velocity of light and that Planck's constant is not zero are related. This would imply that QM and Special Relativity are related at a fundamental level. Comments? Thanks in advance.
 
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referframe said:
A few of the formulas that I have seen for calculating Planck's constant involve, amoung other things, dividing by the velocity of light.

Can you give an example or two?
 
Please see the attached PDF file describing how to measure and compute Planck's constant, h, from LED's. Does not this imply that h and c are inversely related?
 

Attachments

referframe said:
Please see the attached PDF file describing how to measure and compute Planck's constant, h, from LED's. Does not this imply that h and c are inversely related?

no, they are independent fundamental constants.
 
referframe said:
Please see the attached PDF file describing how to measure and compute Planck's constant, h, from LED's. Does not this imply that h and c are inversely related?

In the document, it is given that slope = hc/e.Then using slope,c and e we can find h.
My question is,for finding the slope itself we have to use h first.

Both h and c are just constants. we have so many equations in physics having constants in it. that doesn't mean constants are inter related or inter dependent? They don't change. That's why they are constants unless we change units.
 
The only reason c is in that equation is because in this experiment we use the wavelength of the light in the calculation, rather than its frequency. If we started out knowing or measuring the frequency of the light instead, c wouldn't appear in the calculation.
 

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