Can someone tell me planck constant?

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Discussion Overview

The discussion revolves around the Planck constant, including its value, variations in representation, and the existence of proofs supporting its validity. Participants express confusion over the consistency of the constant's representation and seek clarification on its precise value and the nature of its proofs.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests the full Planck constant and questions the variability in its representation.
  • Another participant provides the value of the Planck constant in both SI units and electronvolts, noting that different units yield different representations.
  • Concerns are raised about the impossibility of knowing every digit of the Planck constant due to measurement limitations.
  • Some participants mention the existence of various experimental proofs of the Planck constant but do not provide specific examples.
  • References to external sources and previous discussions on similar topics are shared, indicating a broader context of inquiry.
  • A participant cites a textbook definition of the reduced Planck constant (ħ) and its relation to the original Planck constant (h), highlighting potential confusion in terminology.

Areas of Agreement / Disagreement

Participants generally agree that the exact representation of the Planck constant can vary and that no one knows every digit due to measurement constraints. However, there is no consensus on the existence of discrepancies in its value across different sources, as some participants assert that they found no disagreement in popular sources.

Contextual Notes

Some limitations include the dependence on the units used for the Planck constant and the unresolved nature of the request for a definitive proof of its value. The discussion also reflects uncertainty about the sources of perceived discrepancies in the constant's representation.

Alexander~E=hv
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Every time i see it it's different. I want the full Planck constant(every number) and is there any proof for the constant?
 
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The Planck constant is:
6.63 x 10^-34 J•s

The symbol is "h". You will have different values depending on the units used. For example, Planck Constant is also:

4.135667516(91) x 10^-15 in eV•s

There are various proofs of the constant on the internet. A lot of the ones I see are experimental proofs.
 
Alexander~E=hv said:
Every time i see it it's different. I want the full Planck constant(every number) and is there any proof for the constant?
Nobody can comply with your request because nobody knows every digit - nobody can measure that accurately.
You can look up the standard value online. I don't know of sources disagreeing, can you supply an example?
There are many proofs for the constant - you can look those up too.
Do you have reason to suspect that it may not be?

Uh OK - in SI units: 6.62606957 × 10-34 m2 kg / s But in unified units it is 1.
So, in that sense, you can know every digit ...

AS for proofs - see:
http://iopscience.iop.org/0034-4885/76/1/016101
 
Simon Bridge said:
Nobody can comply with your request because nobody knows every digit - nobody can measure that accurately.

You can look up the standard value online. I don't know of sources disagreeing, can you supply an example?

There are many proofs for the constant - you can look those up too.

Do you have reason to suspect that it may not be?
Ah I missed the "whole digit thing". Yeah, I agree with Simon! There isn't someone who actually knows every digit of the Planck constant.
 
Thank you all for the answers
 
An extremely strange request.

Zz.
 
David J. Griffiths's Introduction to Quantum Mechanics defines hbar=h/(2pi) =1.05x10^(-34)J•s, and calls it "Planck's constant" before backing up and calling it "his original constant (h) divided by 2pi."
 

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