According to the de-Broglie hypothesis according to which all matters have both particle and wave nature. where $\mathrm{h}=$ plank's constant, $\mathrm{p}=$momentum, $\mathrm{\lambda }=$ wavelength of particle. This type of graph is called a rectangular hyperbola. As $\mathrm{\lambda }\propto \frac{1}{\mathrm{p}}$ we will have a rectangular hyperbola.

$\lambda =\frac{\mathrm{h}}{\mathrm{p}}\left[\lambda \propto \frac{1}{\mathrm{p}}\right]$

$\Rightarrow \lambda \mathrm{p}=\mathrm{h}$ (constant)

So, the plot is a rectangular hyperbola.