Work function is the energy that must be expended to knock an electron out of a solid (e.g. out of a metal plate). Usually, the work function is given in the unit "eV" (electron volt):$$ 1 \, \mathrm{eV} = 1.6 \cdot 10^{-19} \, \mathrm{J} $$

Cutoff wavelength

$$ \class{red}{\lambda_0} $$ Unit $$ \mathrm{m} $$

Cutoff wavelength is the minimum wavelength that light must have in order to be able to knock electrons out of a metal plate.

$$ h $$ Unit $$ \mathrm{Js} = \frac{ \mathrm{kg} \, \mathrm{m}^2 }{ \mathrm{s} } $$

Planck's constant is a physical constant that occurs in the equations when the phenomenon under consideration shows a quantum mechanical character. The Planck's constant has the value: $$ h ~=~ 6.626 \cdot 10^{-34} \, \mathrm{Js} $$

Speed of light (in vacuum) is a physical constant and has the value:$$ c ~=~ 3 \cdot 10^8 \, \frac{\mathrm m}{\mathrm s} $$

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