# Are matter waves the same as de Broglie waves?

$\lambda = \frac{h}{p}$
where $\lambda$ is the characteristic wavelength, $p$ is the momentum, and $h$ is Planck's constant ($6.626 \times {10}^{- 34} J - s$).
Using this relation, one may calculate the characteristic wavelength of a particle with known momentum, $p$, or calculate the momentum of a light wave of known wavelength, $\lambda$.