MHT CET Physics question

The de Broglie wavelength of a neutron of K.E. 150 eV and its mass is kg is:

Answer: (A)

Solution

\dfrac{h}{\sqrt{2mK}}\dfrac{6.63×10^{-34}}{\sqrt{2×1.675×10^{-27}×150×1.6×10^{-19}}}$≈2.

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Question ID VK-084508