Planck's constant
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Planck's constant "h" is a constant in physics that relates the energy of a photon to the frequency of that photon:
- <math> E = h \nu</math>
Where E is the energy of the photon and <math>\nu</math> is its frequency.
The value of Planck's constant is approximately 6.626 × 10-34 joule-seconds[Citation Needed].