If electron, proton, neutron, and alpha particle have same velocity which of them have shortest wavelength?
Correct answer: D. Alpha particle
- A. Electron
- B. Proton
- C. Neutron
- D. Alpha particle
Explanation
The wavelength of a particle is inversely proportional to its momentum. Momentum is given by the product of mass and velocity. Alpha particles has the highest mass, consisting of two protons and two neutrons. Since all the particles are assumed to have the same velocity, the alpha particle will have the highest momentum due to its higher mass. Therefore, the alpha particle will have the shortest wavelength compared to the electron, proton, and neutron, which have lower masses.
This question appeared on the UHS MDCAT 2022 paper, which you can sit online with every answer explained.
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About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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