CBSE 2026 · Region 3 · Set 1 · Q9 · 1 mark
A proton and an alpha particle have equal momentum. The ratio of their kinetic energies ( $\displaystyle \mathrm{E}_{\mathrm{p}} / \mathrm{E}_{\mathrm{a}}$ ) and de Broglie wavelengths associated with them $\displaystyle \left(\lambda_{\mathrm{p}} / \lambda_{\mathrm{a}}\right)$ respectively are :
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle 4, 1$
Dual Nature of Radiation and MatterWave Nature of MatterApplymcqmedium
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.