Planck frequency

Planck frequency (plural Planck frequencies)

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

• Planck angular frequency
• Planck unit