If the mass of neutron is 1.7 10 -27 kg , then the de-Broglie wavelength of neutron of energy 3eV is : (h=6.6 10 -34 Js )

1. A. 1.4 10 -11 m
2. B. 1.6 10 -10 m
3. C. 1.65 10 -11 m
4. D. 1.4 10 -10 m

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