Antoine Lefevre 
IN BRIEF Medical physics: intersection between physics and medicine. Use of ionizing radiation for diagnosis and therapy. Medical imaging: techniques that transform diagnosis through various modalities. Role of the medical physicist in the development and application of imaging technologies. Ultrasound: use of sound waves for non-invasive imaging. Advances in radiotherapy for the treatment of diseases. … Read more
IN BRIEF Definition of semiconductors: materials that have intermediate electrical properties. Types of semiconductors: intrinsic and doped. Applications: found in smartphones, computers, and vehicles. Impact on power electronics: control and conversion of electrical energy. Key role in artificial intelligence: processing speed and energy efficiency. Recent innovations: evolution towards nano-technologies and reduction of energy consumption. Essential … Read more
IN BRIEF Chimiephysique.free.fr: Free courses and exercises for all levels from middle school to high school. PCCL: Site dedicated to physical chemistry for middle and high school. Labolycée: Access to various educational resources. Physique-chimie.fr: Content tailored for autonomous learning. Physics 2000: Resources in English to deepen concepts. Éduscol: Information on the use of digital technologies … Read more
IN BRIEF Renewable energies (RE): energy production modes from natural resources Examples: solar energy, wind energy, hydraulic energy, biomass, geothermal energy Characteristics: inexhaustible properties, respect for the environment Main sources: Sun and Earth Crucial role in the fight against climate change Positive impact: reduction of carbon footprint, ecological benefits Physical principles associated with renewable energy … Read more
IN BRIEF Multiverse: Concept of multiple coexisting universes. Hypotheses: Emanating from theoretical physics, notably the string theory. Parallel dimensions: Possibility of dimensions beyond our classical understanding. Cosmic inflation: Rapid expansion of the early universe suggesting other universes. Evidence: Difficulty in testing the multiverse hypothesis. Scientific speculations: Variety of possible scenarios surrounding the multiverse. Time travel: … Read more
IN BRIEF Fermi Paradox: Questions about extraterrestrial life. Schrödinger’s Cat Paradox: State of quantum superposition. Zenon’s Paradox: Challenges to the nature of motion. Archer’s Paradox: Relationship between movement and target. Black Hole Paradox: Problem of lost information. Dark Night Paradox: Cosmological inconsistency of the universe. Faint Young Sun Paradox: Issues regarding Earth’s past temperature. Resolution … Read more
IN BRIEF Natural phenomenon of electrostatic discharge. Occurs during thunderstorms in clouds called cumulonimbus. Accumulation of electric charges causing tremendous voltages. Occurs between clouds or between a cloud and the ground. Can reach temperatures of 30,000 °C. The speed of the discharge can exceed 200,000 km/h. Lightning is a common natural electric arc. Potential impacts … Read more
IN BRIEF Nature of light: form of visible electromagnetic energy. Visible spectrum: red (longest wavelength) to violet (shortest wavelength). White light: polychromatic, containing different radiations. Propagation: movement of energy without transportation of matter. Physical phenomenon: behaviors of waves and particles. Thermal exchanges: objects emit according to their temperature. Light is a fascinating phenomenon that plays … Read more
IN BRIEF Scientific culture: Appropriation of fundamental knowledge. Circulation of knowledge: Exchanges between disciplines and experimental practices. Future developments: Reasoning and innovation for the next 50 years. Mental training: Importance of physics in critical reasoning. Fluid science: Understanding natural phenomena and environmental issues. Interdisciplinarity: Role of physics in other disciplines and fields of study. Digital … Read more
IN BRIEF Hidden dimensions in the Universe: concepts and theories. Mechanism to confer mass to neutrinos. Physics of particles confined on surfaces called branes. Exploration of hidden variables in quantum physics. Kaluza-Klein theory and additional dimensions. Search for particles of the standard model and the graviton. Links with concepts of multiverse and time travel. Attempts … Read more