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Formula Photon Momentum    Wavelength   

Formula
Formula: Photon
Photons with different frequency

Momentum

Unit
Momentum of a photon (light particle). The smaller the wavelength, the larger the momentum. Ultraviolet photons thus have a larger momentum than photons from the visible wavelength range.

This momentum can be transferred to atoms, for example, to slow them down or decelerate them.

Wavelength

Unit
Wavelength of light. This is the distance between two wave crests / troughs of a monochromatic light source. So it tells within which distance \( \lambda \) exactly one periodic oscillation of the light wave was completed.

Planck's Constant

Unit
Planck's constant is a physical constant (of quantum mechanics) and has the value: \( h ~=~ 6.626 \cdot 10^{-34} \, \mathrm{Js} \).