# What are some examples of the Planck's constant?

1] Energy $E$ of a Photon of frequency $\nu$:
$E = h \cdot \nu$
2] DeBroglie wavelength $\lambda$ for a "wavicle" (matter wave) of momentum $p$:
$\lambda = \frac{h}{p}$;
3] Heisenberg Uncertainty Principle: relating the uncertainties in the values of position $x$ and momentum $p$ of a particle (microscopically);
$\Delta x \Delta p \ge \frac{h}{2 \pi}$