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(a) For what kinetic energy of a neutron...

(a) For what kinetic energy of a neutron will the associated de Broglie wavelength be `1.40 xx 10^(-10) m`?
(b) Also find the de Broglie wavelength of a neutron, in thermal equilibrium with matter, having an average kinetic energy of (3/2) k T at 300 K.

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(a) `6.686xx10^(-21)J=4.174xx10^(-2)eV`
(b) 0.145 nm
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