Dual behaviour of matter proposed by de Broglie led to the discovery of electron microscope often used for the highly magnified images of biological molecules and other type of material

From de Broglie's equation,

$\lambda=\frac{\mathrm{h}}{m v}$

$\lambda=\frac{6.626 \times 10^{-34} \mathrm{Js}}{\left(9.10939 \times 10^{-31} \mathrm{~kg}\right)\left(1.6 \times 10^{6} \mathrm{~ms}^{-1}\right)}$

$=4.55 \times 10^{-10} \mathrm{~m}$

$\lambda=455 \mathrm{pm}$

$\therefore$ de Broglie's wavelength associated with the electron is $455 \mathrm{pm}$.