Planck frequency

== English == === Noun === Planck frequency (plural Planck frequencies) (physics) A repeating event that occurs once every Planck time, with a frequency of F p = 1 2 π c 5 ℏ G = E P / h ≈ 2.952 × 10 42 Hz . {\displaystyle F_{p}={\frac {1}{2\pi }}{\sqrt {\frac {c^{5}}{\hbar G}}}=E_{P}/h\approx 2.952\times 10^{42}{\mbox{ Hz}}.} this frequency is said to be the upper bound for the frequency of an electromagnetic ray or cosmic rays. === See also === Planck angular frequency Planck unit