# Formula: Photon Energy Per Mole Wavelength    Avogadro constant    Speed of light

## Photon energy per mole

Unit
Photon energy per mole indicates the energy of $$6 \cdot 10^{23}$$ photons. This amount of photons makes up one mole.

## Wavelength

Unit
Wavelength of the used light. The smaller the wavelength, the greater the energy of one mole of photons.

Unit
The Avogadro constant is a physical constant with the value $$N_{\text A} ~=~ 6 \cdot 10^{23} \, \frac{1}{\mathrm{mol}}$$ and represents the number of photons that are in one mole.

## 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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