The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (kelvin) and mass m, is

Question

${h \over {\sqrt {3mkT} }}$

${{2h} \over {\sqrt 3 mkT}}$

${{2h} \over {\sqrt {mkT} }}$

${h \over {\sqrt {mkT} }}$

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