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Physics · 2026 · 2 marks
CBSE 2026 · Region 3 · Set 2 · Q17
Calculate the de Broglie wavelength of a neutron having kinetic energy of 150 eV.
Calculate the de Broglie wavelength of a neutron having kinetic energy of $\displaystyle 150$ eV.
Marking-scheme solution
$\displaystyle \lambda=\dfrac{h}{\sqrt{2 m\, K.E}}$
$\displaystyle =\dfrac{6.63 \times 10^{-34}}{\sqrt{2 \times 1.6 \times 10^{-27} \times 150 \times 1.6 \times 10^{-19}}}$
$\displaystyle =2.3 \times 10^{-12}$
$\displaystyle =2.3 \mathrm{~pm}$
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