The graph which shows the variation of (1/(λ^2)) and its kinetic energy, E is (where λ is de Broglie wavelength of a free particle):

The graph which shows the variation of $\displaystyle \left(\frac{1}{\lambda^2}\right)$ and its kinetic energy, $\displaystyle E$ is (where $\displaystyle \lambda$ is de Broglie wavelength of a free particle) :