The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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inverse meter-hertz relationship
 $(1 \ {\rm m}^{-1})c$
 Value  299 792 458 Hz
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  299 792 458 Hz    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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