Which of the following is correct for the de Broglie wavelength λ of a particle when the kinetic energy of the particle is E_K?

A. $\lambda  \propto \frac{1}{{{E_{\rm{K}}}}}$

B. $\lambda  \propto \frac{1}{{\sqrt {{E_{\rm{K}}}} }}$

C. $\lambda  \propto {E_K}$

D. $\lambda  \propto {E_K}^{\rm{2}}$

B