The wavelength of light from the spectra...

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 neutron, would have the same de Broglie wavelength.

Verified by Experts

(a) `6.95xx10^(-25)J=4.34mueV`
(b) `3.78xx10^(-28)J=0.236neV`

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