CBSE 2026 · Region 3 · Set 2 · Q17 · 2 marks
Calculate the de Broglie wavelength of a neutron having kinetic energy of $\displaystyle 150$ eV.
Marking-scheme solution
$\displaystyle \lambda=\dfrac{h}{\sqrt{2 m\, K.E}}$
$\displaystyle =\dfrac{6.63 \times 10^{-34}}{\sqrt{2 \times 1.6 \times 10^{-27} \times 150 \times 1.6 \times 10^{-19}}}$
$\displaystyle =2.3 \times 10^{-12}$
$\displaystyle =2.3 \mathrm{~pm}$
Dual Nature of Radiation and MatterWave Nature of MatterApplyvery_short_answermedium
More from Dual Nature of Radiation and Matter
- Consider a neutron (mass m ) of kinetic energy E and a photon of the same energy. Let λ n and λ p be the de…2024 · asked 3×
- Assertion: Photoelectric current increases with an increase in intensity of incident radiation, for a given…2024 · asked 3×
- Figure shows the variation of photoelectric current measured in a photo cell circuit as a function of the…2023 · asked 3×
- Atomic spectral emission lines of hydrogen atom are incident on a zinc surface. The lines which can emit…2025 · asked 3×
- A beam of red light and a beam of blue light have equal intensities. Which of the following statements is…2025 · asked 3×
- Assertion: If accelerated electrons are passed through a narrow slit, a diffraction pattern is observed.…2026 · asked 3×
- Assertion: In photoelectric effect, the kinetic energy of the emitted photoelectrons increases with increase…2024 · asked 3×
- The figure shows v m^2 versus 1/(λ) graph for photoelectrons emitted from a surface where v m is the maximum…2023 · asked 3×
CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.