If the kinetic energy of an electron of mass $9.0 \times 10^{-31} \mathrm{~kg}$ is $8.0 \times 10^{-25}…
If the kinetic energy of an electron of mass $9.0 \times 10^{-31} \mathrm{~kg}$ is $8.0 \times 10^{-25} \mathrm{~J}$, the wavelength of this electron in $\mathrm{nm}$ is