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We found 2 dictionaries that define the word Planck frequency:

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  1. Planck frequency: Wiktionary
  2. Planck frequency: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (Planck frequency)

noun:  (physics) A repeating event that occurs once every Planck time, with a frequency of F_p=1/(2π)√=E_P/h≈2.952×10⁴² mbox Hz. this frequency is said to be the upper bound for the frequency of an electromagnetic ray or cosmic rays.

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