Planck velocity equals one Planck length per Planck time:

It seems, in 1900 Max Planck's equation was primarily E = f(λ). In 1905 Einstein promoted c = fλ.

The world over knows c is devised in the theory of special relativity, where c = fλ = √E/m.

However, according to Max Planck the velocity of electromagnetic waves, or light, is equal to one Planck length per Planck time; the limit to which photons can travel. 

(Read More... Planck Length by Max Planck.) 

• Planck time ~ 5.39×10^−44 s.
• Planck length ~ 1.61626×10^−35 m.
• c =~3x10^8 m/s.

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