Every experimental problem

The experimental problems of six international physics olympiads, by year. Anything marked Run opens as working apparatus in the browser — it shows what the instruments show and computes nothing for you.

IPhO — International Physics Olympiad

International · 27 years · 44 experimental problems

IPhO 2026 Bucaramanga, Colombia

E1 Ideal Gas, Vapor Pressure, and Heat Conduction Run · Sheet · Solution

IPhO 2025 Paris, France

E1 Earth's Magnetic Field Measurement Run · Sheet · Solution
E2 Sand Craters and Dunes Run · Sheet · Solution

IPhO 2024 Isfahan, Iran

E1 Heat Conduction in a Copper Rod Sheet · Solution
E2 Diffraction from Phase Steps Sheet · Solution

IPhO 2023 Tokyo, Japan

E1 Mass Measurement Sheet · Solution
E2 Birefringence Sheet · Solution

IPhO 2022 Switzerland, online

E1 Planet Run · Sheet · Solution
E2 Cylindrical Diode Run · Sheet · Solution

IPhO 2021 Vilnius, Lithuania, online

E1 Non-ideal Capacitors Sheet · Solution
E2 LEDs Sheet · Solution

IPhO 2020 IdPhO · organised by MIPT, online

E1 Crystallography Sheet · Solution

IPhO 2019 Tel Aviv, Israel

E1 Optical Measurements Sheet · Solution
E2 Wiedemann–Franz Law Run · Sheet · Solution

IPhO 2018 Lisbon, Portugal

E1 Paper Transistor Run · Sheet · Solution
E2 Viscoelasticity of a Polymer Thread Run · Sheet · Solution

IPhO 2017 Yogyakarta, Indonesia

E1 Optics of a Salt Solution Run · Sheet · Solution
E2 Parallel Dipole Line Magnetic Trap for Earthquake and Volcanic Sensing Run · Sheet · Solution

IPhO 2016 Zurich, Switzerland

E1 Electrical Conductivity in 2D Sheet · Solution
E2 Jumping Beads Sheet · Solution

IPhO 2015 Mumbai, India

E1 Diffraction due to Helical Structure Sheet · Solution
E2 Diffraction due to Surface Tension Sheet · Solution

IPhO 2014 Astana, Kazakhstan

E1 To see invisible! Sheet · Solution

IPhO 2013 Copenhagen, Denmark

E1 Speed of Light Sheet · Solution
E2 Solar Cells Sheet · Solution

IPhO 2012 Tartu and Tallinn, Estonia

E1 The Magnetic Permeability of Water Sheet · Solution
E2 Nonlinear Black Box Sheet · Solution

IPhO 2011 Bangkok, Thailand

E1 Blackbox: Capacitive Displacement Sensor Run · Sheet · Solution
E2 Mechanical Blackbox: A Cylinder with a Ball Inside Run · Sheet · Solution

IPhO 2010 Zagreb, Croatia

E1 Elasticity of Sheets Sheet · Solution
E2 Forces between Magnets Sheet · Solution

IPhO 2009 Mérida, Mexico

E1 Wavelength of a Diode Laser Sheet · Solution
E2 Birefringence of Mica Sheet · Solution

IPhO 2008 Hanoi, Vietnam

E1 Differential Thermometric Method Sheet · Solution

IPhO 2007 Isfahan, Iran

E1 Band Gap of Semiconductor Thin Films Sheet · Solution

IPhO 2006 Singapore

E1 Interference, Reflection and Diffraction Sheet · Solution

IPhO 2005 Salamanca, Spain

E1 Planck's Constant in an Incandescent Lamp Sheet · Solution

IPhO 2004 Pohang, South Korea

E1 Mechanical "Black Box" Sheet · Solution

IPhO 2003 Taipei, Taiwan

E1 Optical Properties of Laser Diode Sheet · Solution

IPhO 2002 Bali, Indonesia

E1 Physical Constants with Electrolysis Sheet · Solution
E2 Optical Black Box Sheet · Solution

IPhO 2001 Antalya, Turkey

E1 Rotating Liquid Sheet · Solution

IPhO 2000 Leicester, United Kingdom

E1 CD-ROM Spectrometer Sheet
E2 The Magnetic Puck Sheet

APhO — Asian Physics Olympiad

Asia · 26 years · 42 experimental problems

APhO 2026 Busan, South Korea

E1 Water Clock Experiment Run · Sheet · Solution
E2 Estimation of Unknown Resistance Run · Sheet · Solution

APhO 2025 Dhahran, Saudi Arabia

E1 Physics of Induction Cooking Run · Sheet · Solution

APhO 2024 Kampar, Malaysia

E1 Gyroscope Run · Sheet · Solution

APhO 2023 Ulaanbaatar, Mongolia

E1 Hertzian Contact Stress Run · Sheet · Solution
E2 Interference from a Thermally Deformed Surface Run · Sheet · Solution

APhO 2022 Dehradun, India, online

E1 Magnetic Black Box Run · Sheet · Solution
E2 Acoustic Black Box Run · Sheet · Solution

APhO 2021 Taipei, Taiwan, online

E1 Elasticity of Cantilever Run · Sheet · Solution
E2 Exploring the Spatial Structure of the Sample with Optical Methods Run · Sheet · Solution

APhO 2019 Adelaide, Australia

E1 Static Response of a Magnetically Active Fluid Sheet · Solution
E2 Wave Pulses in a Magnetically Active Fluid Sheet · Solution

APhO 2018 Hanoi, Vietnam

E1 Giant Magnetoresistance (GMR) Sheet · Solution

APhO 2017 Yakutsk, Russia

E1 Photonic Crystal Sheet · Solution

APhO 2016 Hong Kong

E1 Reflected Optical Diffraction Patterns from One-Dimensional Structures Sheet · Solution
E2 Reflection Phase Shift of Metal Sheet · Solution

APhO 2015 Hangzhou, China

E1 The Piezoelectric Effect and Its Applications Sheet · Solution

APhO 2014 Singapore

E1 Speed of Ultrasonic Sound in Solution Sheet · Solution

APhO 2013 Bogor, Indonesia

E1 Wind Power and Its Metrologies Sheet · Solution

APhO 2012 New Delhi, India

E1 Friction Sheet · Solution
E2 Electromagnetic Induction Sheet · Solution

APhO 2011 Tel Aviv, Israel

E1 Levitation of Conductors in an Oscillating Magnetic Field Sheet · Solution
E2 An Optical "Black Box" Sheet · Solution

APhO 2010 Taipei, Taiwan

E1 Magnetic Force Probe Sheet · Solution
E2 Understanding Semiconductor Lasers Sheet · Solution

APhO 2009 Bangkok, Thailand

E1 The Earth's Horizontal Magnetic Field Sheet · Solution
E2 Oscillation of a Water-Filled Vessel Sheet · Solution

APhO 2008 Ulaanbaatar, Mongolia

E1 The Physics of Sound Waves Sheet

APhO 2007 Shanghai, China

E1 Interference Method for the Thermal Expansion and Refractive Index of Glass Sheet · Solution
E2 Measurement of Liquid Electric Conductivity Sheet · Solution

APhO 2006 Almaty, Kazakhstan

E1 Specific Heat of Aluminium and Latent Heat of Evaporation Sheet · Solution

APhO 2005 Pekanbaru, Indonesia

E1 Determination of Shapes by Reflection In preparation
E2 Magnetic Braking on an Inclined Plane In preparation

APhO 2004 Hanoi, Vietnam

E1 Hall Effect and Magnetoresistivity Effect Sheet · Solution
E2 Black Box Sheet

APhO 2003 Bangkok, Thailand

E1 Determination of Capacitance Sheet · Solution
E2 Cylindrical Bore Sheet · Solution

APhO 2002 Singapore

E1 Measurement of Reflectance and Determination of Refractive Index Sheet
E2 Frequency of Vibration of a Tuning Fork Sheet · Solution

APhO 2001 Taipei, Taiwan

E1 Basic Characteristics of Solar Cells Sheet · Solution

APhO 2000 Karawaci, Indonesia

E1 Determination of the Density of Oil In preparation
E2 Determination of the Stefan–Boltzmann Constant In preparation

EuPhO — European Physics Olympiad

Europe · 10 years · 14 experimental problems

EuPhO 2026 Gothenburg, Sweden

E1 Acoustic Levitation Sheet · Solution

EuPhO 2025 Sofia, Bulgaria

E1 Deep Learning Sheet · Solution
E2 Hidden Pattern Sheet · Solution

EuPhO 2024 Kutaisi, Georgia

E1 Physics of Piezoelectricity Sheet · Solution

EuPhO 2023 Hannover, Germany

E1 Magnetic Pendulum Sheet · Solution
E2 Optical Black-Box Sheet · Solution

EuPhO 2022 Ljubljana, Slovenia

E1 Physics of Illumination Sheet · Solution

EuPhO 2021 Online, hosted by Estonia

E1 Hidden Wire Run · Sheet · Solution
E2 Hot Cylinder Run · Sheet · Solution

EuPhO 2020 Satu Mare, Romania, online

E1 Hidden Charge Run · Sheet · Solution
E2 Black Box Run · Sheet · Solution

EuPhO 2019 Riga, Latvia

E1 Propagation of Radio Waves Sheet

EuPhO 2018 Dolgoprudny, Russia

E1 Porous Membrane Sheet · Solution

EuPhO 2017 Tartu, Estonia

E1 Light-Emitting Diode Sheet · Solution

NBPhO — Nordic-Baltic Physics Olympiad

Nordic & Baltic · 13 years · 14 experimental problems

NBPhO 2025 Tallinn, Estonia

E1 Black Box Sheet · Solution

NBPhO 2023 Tallinn, Estonia

E1 Black Box Sheet · Solution

NBPhO 2018 Tallinn, Estonia

E1 Black Box Sheet · Solution

NBPhO 2017 Tallinn, Estonia

E1 Black Box Sheet · Solution

NBPhO 2016 Tallinn, Estonia

E1 Black Box Sheet · Solution

NBPhO 2012 Tallinn, Estonia

E1 Black Box Sheet · Solution

NBPhO 2011 Tallinn, Estonia

E1 Black Box Sheet · Solution

NBPhO 2010 Tallinn, Estonia

E1 Black Box Sheet · Solution

NBPhO 2009 Tallinn, Estonia

E1 Black Box Sheet · Solution

NBPhO 2006 Tallinn, Estonia

E1 Electric Experiment Sheet · Solution
E2 Optics Experiment Sheet · Solution

NBPhO 2005 Tallinn, Estonia

E1 Mechanical "Black Box" Sheet · Solution

NBPhO 2004 Tallinn, Estonia

E1 Black Box Experiment Sheet · Solution

NBPhO 2003 Tallinn, Estonia

E1 Magnetic Experiment Sheet · Solution

ISPhO — International Scientific Physics Olympiad

International · 4 years · 6 experimental problems

ISPhO 2026 Online

E1 Fiber Bragg Grating Run · Sheet

ISPhO 2025 Khanty-Mansiysk, Russia · MIPT

E1 LED Color Sheet · Solution
T1 Ferromagnetic Domain Wall Dynamics Theory Run · Sheet · Solution

ISPhO 2024 Khanty-Mansiysk, Russia · MIPT

E1 Absorption Spectroscopy and Chemical Kinetics Sheet · Solution
T1 Thermal Oxidation Theory Sheet · Solution

ISPhO 2023 Khanty-Mansiysk, Russia · MIPT

T1 Polycrystal Diffusion Theory Sheet · Solution

RMPh — Romanian Master of Physics

Invitational · Romania · 8 years · 11 experimental problems

RMPh 2024 Bucharest, Romania

E1 Ferromagnetic phase transition: The Ising model Run · Sheet · Solution

RMPh 2023 Bucharest, Romania

E1 Experimental studies in rotating reference frames Run · Sheet

RMPh 2021 Online

E1 Measurement of D⁰ lifetime Run · Sheet · Solution

RMPh 2018 Bucharest, Romania

E1 Polycrystals and monomolecular layers Sheet

RMPh 2017 Bucharest, Romania

E1 Polarization and Photodiodes Sheet · Solution

RMPh 2014 Bucharest, Romania

E1 Determination of data using a chronometer Sheet · Solution
E2 Eletrical Black Box Sheet · Solution

RMPh 2013 Bucharest, Romania

E1 Porosity Sheet · Solution
E2 Black Box Sheet · Solution

RMPh 2012 Bucharest, Romania

E1 Maxwell-Boltzmann distributions Sheet · Solution
E2 Optics with lasers Sheet · Solution