APhO Problems and Solutions

2024

Malaysia

Geometry of Water Fountain

📝Problem

Snell’s Law

📝Problem

The First Discovered Quasar

📝Problem

2023

Mongolia

ISS Orbital Decay Dynamics

📝Problem  💡Solution

A ball on a turntable

📝Problem  💡Solution

Cavitation

📝Problem  💡Solution

2022

India

(Online)

The Stern-Gerlach Experiment

📝Problem  💡Solution

A Mechanical Model for Phase Transitions

📝Problem  💡Solution

Maxwell, Rayleigh and Mount Everest: THE PROBLEM

📝Problem  💡Solution

2021

Chinese Taipei

(Online)

Water-Hammer Effect

📝Problem  💡Solution

Ray Tracing

📝Problem  💡Solution

Magnetic Levitation

📝Problem  💡Solution

2019

Australia

RF Reflectometry of Single-Electron  Circuits

📝Problem  💡Solution

Jets from AGN

📝Problem  💡Solution

Tippe Top

📝Problem  💡Solution‎

2018

Vietnam

Optical Trap of Neutral Atoms

📝Problem 💡Solution

Space Elevator

📝Problem  💡Solution

Thermoelectric Effects

📝Problem  💡Solution‎

2017

Russia

Vortices in Superfluid

📝Problem  💡Solution

Evolution of Supermassive Black Hole Binary

📝Problem  💡Solution

Space Debris

📝Problem  💡Solution

2016

Hong  Kong

Mechanics of a Deformable Lattice

📝Problem  💡Solution

The  Expanding Universe

📝Problem  💡Solution

Magnetic Field Effects on Superconductors

📝Problem  💡Solution

2015

China

Fractional Quantum Hall Effect (FQHE)

📝Problem  💡Solution

How are Aurora Ignited by the Solar Wind?

📝Problem  💡Solution

Fabry-Perot (F-P) Etalon

📝Problem  💡Solution

2014

Singapore

Hadley Circulation

📝Problem  💡Solution

Two-Slit Electron Interference

📝Problem  💡Solution

Gravitational Lensing

📝Problem  💡Solution

2013

Indonesia

Conductors in  Conducting Liquid

📝Problem  💡Solution

Relativistic Correction on GPS Satellite

📝Problem  💡Solution

Physics of Spin

📝Problem  💡Solution

2012

India

The Drag of a Falling Magnet

📝Problem  💡Solution

Chandrasekhar Limit

📝Problem  💡Solution

Pancharatnam Phase

📝Problem  💡Solution

2011

Israel

The Shockley-James Paradox

📝Problem  💡Solution

Creaking Door

📝Problem  💡Solution

Birthday Balloon

📝Problem  💡Solution

2010

Chinese Taipei

Particles and Waves

📝Problem  💡Solution

Strong Resistive Electromagnets

📝Problem  💡Solution

Electron and Gas Bubbles in Liquids

📝Problem  💡Solution

2009

Thailand

Rolling Cylinders

📝Problem  💡Solution

A  Self-excited Magnetic Dynamo

📝Problem  💡Solution

The Leidenfrost Phenomenon

📝Problem  💡Solution

2008

Mongolia

Tea Ceremony and Physics of Bubbles

📝Problem  💡Solution

Ionic Crystal, Yukawa-type Potential and Pauli Principle

📝Problem  💡Solution

How does a superluminal object look like?

📝Problem  💡Solution

2007

China

Back-and-Forth Rolling of a  Liquid-Filled Sphere

📝Problem  💡Solution

Optical properties of an unusual material

📝Problem  💡Solution

Specific heat of free electron gas at constant volume

📝Problem  💡Solution

2006

Kazakhstan

Laser cooling of atoms

📝Problem  💡Solution

Oscillator damped by sliding friction

📝Problem  💡Solution

Three Problems

📝Problem  💡Solution

2005

Indonesia

Spring Cylinder With Massive Piston

📝Problem  💡Solution

Magnetic Focusing

📝Problem  💡Solution

Light Deflection by a Moving  Mirror

📝Problem  💡Solution

2004

Vietnam

Measure the mass in the weightless state

📝Problem  💡Solution

Optical Fiber

📝Problem  💡Solution

Compression and expansion of a two gases system

📝Problem  💡Solution

2003

Thailand

Satellite’s orbit transfer

📝Problem  💡Solution

Optical Gyroscope

📝Problem  💡Solution

Plasma Lens

📝Problem  💡Solution

2002

Singapore

Vibrations of a Linear Crystal Lattice

📝Problem  💡Solution

The Rail Gun

📝Problem  💡Solution

Water Fabrication

📝Problem  💡Solution

2001

Chinese Taipei

When will the Moon become a Synchronous Satellite?

📝Problem  💡Solution

Motion of an Electric Dipole in a Magnetic Field

📝Problem  💡Solution

Thermal Vibrations of Surface Atoms

📝Problem  💡Solution

2000

Indonesia

Eclipses of the Jupiter’s Satellite

📝Problem  💡Solution

Detection of Alpha Particles

📝Problem  💡Solution

Stewart-Tolman Effect

📝Problem  💡Solution