Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Planck's constant is a physical constant that is the quantum of electromagnetic action which relates the energy carried by a photon to its frequency. Its symbol is h and it has a value of 6.62607015 × 10^-34 m^2 kg / s.
Related terms
Photon Energy: The amount of energy carried by a single photon, calculated using Planck’s constant and the frequency or wavelength of light.
The number of complete cycles per unit time for any periodic motion (like waves). Imagine this as how often you jump on a trampoline - more jumps per minute means higher frequency!