The wavelength of light from the spectral emission line of sodium is 589 nm. Find the kinetic energy at which (a) an electron and (b) a 8 neutron, would have the same de Broglie wavelength.
Given λ= 589 nm = 5.89 × 10–7 m
The de Broglie wavelength λ = h/p = h/√2mEk
