๐Ÿงชap chemistry review

Planck's equation

Written by the Fiveable Content Team โ€ข Last updated August 2025
Verified for the 2026 exam
Verified for the 2026 examโ€ขWritten by the Fiveable Content Team โ€ข Last updated August 2025

Definition

Planck's equation, also known as the Planck-Einstein relation, is a fundamental equation in quantum mechanics that relates the energy of a photon to its frequency. It states that the energy (E) of a photon is equal to its frequency (ฮฝ) multiplied by Planck's constant (h): E = hฮฝ.

"Planck's equation" also found in: