According to the wave-particle duality of matter by de-Broglie,...

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

$\lambda = \dfrac{h}{p}\left[\lambda ∝ \dfrac{1}{p}\right]$

$⇒ \lambdap = h$ (constant)

So, the plot is a rectangular hyperbola.