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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2017
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The de - Brogile wave length of a neutron in thermal equilibrium with heavy water at a temperature T and mass m , is

$\begin{array}{1 1} (1) \large\frac{h}{\sqrt{mkT}} \\ (2) \large\frac{h}{\sqrt{3 mkT}} \\ (3) \large\frac{2h}{\sqrt{3mkT}} \\ (4) \large\frac{2h}{\sqrt{mkT}} \end{array} $

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