Action is energy times time, or momentum times distance, or angular momentum times angle. Light uses path with least action between two points {Hamilton's principle} {principle of least action, Hamilton} {least-action principle, light}|. In quantum mechanics, action has quanta, which have size Planck constant h, so photons have energy quanta h * frequency, momentum quanta h / wavelength, and angular-momentum quanta h / 2 * pi.
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Date Modified: 2022.0224