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Physique-Chimie |
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| Lycée et enseignement supérieur |
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Olympiades Asiatiques de Physique (APhO)
Épreuves théoriques
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| 2025 - Drahran (Arabie Saoudite) |
- Problèmes théoriques
Problème 1 : Precession of the Earth's axis
The shape of the Earth ; the time-averaged gravitational field of the Sun ; the torque acting on the Earth ; angular speed of the precession of the Earth's axis ; the effect of the Moon
Problème 2 :
Waves and phase transitions in spin systems
Precession and interactions of magnetic dipoles ; spin waves ; phase transitions in spin chains
Problème 3 : Atmospheric physics
Surface temperature of the Earth
; the absorption spectrum of atmospheric gases ; stability of air in the atmosphere ; moisture ; sun halo
Énoncé : https://rmph.lbi.ro/2024/index.php?id=problems_physics
Solution : https://www.apho2025.sa/media/zlzlx5zy/theory_solution_apho_2025.pdf
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| 2024 - Kampar (Malaisie) |
- Problèmes théoriques
Problème 1 : Geometry of water fountain
Uniformly distributed holes on the surface of the hemisphere ; non-uniformly distributed holes on the surface of the hemisphere
Problème 2 :
Snell's law
Light propagation through a semi-sphere ; light propagation through a cylindrical rod ; light propagation through an optical fibre
Problème 3 : The first discovered quasar : unveiling the mysteries of the astrophysical source 3C 273
Moon's apparent motion against the background stars ; using lunar occultations to precisely deetermine radio source positions : the case of 3C 273 ; the breakthrough discovery of 3C 273's true nature ; the intrinsic luminosity of the radio source 3C 273 ; the power source of 3C 273 ; modern observations and the nature of 3C 273's components
Énoncé : https://apho2024.utar.edu.my/TExam.php
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| 2023 - Oulan-Bator (Mongolie) |
- Problèmes théoriques
Problème 1 : ISS orbital decay dynamics
Modified barometric formula ;
orbital deceleration and station descent rate ; atmospheric drag ; drag by atomic oxygen ion ; drag by the Earth's magnetic field ; numeric results and conclusion
Problème 2 :
Waves and phase transitions in spin systems
Precession and interactions of magnetic dipoles ; spin waves ; phase transitions in spin chains
Problème 3 : Atmospheric physics
Surface temperature of the Earth
; the absorption spectrum of atmospheric gases ; stability of air in the atmosphere ; moisture ; sun halo
Énoncé, solution et barème : https://apho2024.utar.edu.my/documents/APhO23%20Theoretical%20Exam.zip
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