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.
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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!