# Formula: Compton Scattering Wavelength before    Scattering angle

## Wavelength before

Unit
Wavelength of the photon before the collision.

## Wavelength after

Unit
Wellenlänge des Photons nach dem Stoß.

## Scattering angle

Unit
Scattering angle between the two momentum vectors of the photon after and before the collision.

## Mass

Unit
Mass of the particle (e.g. an electron) at which the photon is scattered.

## Planck's Constant

Unit
Planck's constant $$h$$ is a physical constant from quantum mechanics and has the following exact value: $$h ~=~ 6.626 \, 070 \, 15 ~\cdot~ 10^{-34} \, \mathrm{Js}$$

## Speed of light

Unit
Speed of light is a physical constant and indicates how fast light travels in empty space (vacuum). It has the following exact value in vacuum: $$c ~=~ 299 \, 792 \, 458 \, \frac{ \mathrm{m} }{ \mathrm{s} }$$

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