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Planck's equation

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 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 (ν) multiplied by Planck's constant (h): E = hν.

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