Skip to main content Breadcrumb Go home Go home Language English Deutsch Search Learning snippets Courses Lessons Videos Arguments Questions Exercises Formulary Illustrations Physics disciplinesElectrodynamicsMechanicsQuantum mechanicsSolid-state physicsOpticsThermodynamicsMathematics Physics: Questions and AnswersDo you have a physics question that starts with What, How, Where or Why? Here you will find 24 questions and short but precise answers from different disciplines of physics.Questions of a specific discipline QuestionsPhysics QuestionsMechanics QuestionsThermodynamics QuestionsElectrodynamics QuestionsOptics QuestionsQuantum Mechanics QuestionsSolid State Physics QuestionsMathematics Max. Level - Any -Level 1 (suitable for all)Level 2 (suitable for students)Level 3 (up to Physics B.Sc.)Level 4 (up to Physics M.Sc.) Question What is the Elementary Charge? Question What is the Difference Between Electric and Magnetic Fields? Question What is the Magnetization of a Material? Question What is Wavelength? Question What is Boltzmann Constant? Question What is the Vacuum Permeability (Magnetic Constant)? Question What is the Vacuum Permittivity (Electric Constant)? Question What is Temperature? Question How to Calculate the Moment of Inertia of a Rigid Body? Question What is the Speed of Light? Question What is the Refractive Index? Question How do You Determine the Focal Length of a Lens? Question What is the Planck's Constant? Question Why Can't Electric Field Lines Cross? Question How to Calculate Moment of Inertia when the Axis of Rotation does not Pass Through the Center of Mass? Question What is a Hooke's spring? Question What is the Difference Between an Ohmic and Non-Ohmic Conductor? Question What is Epitaxy? Question How Does Physical Vapor Deposition (PVD) Work? Question What is the energy of one mole of photons? Question Why are field lines always perpendicular to conducting surfaces? Question What is the difference between a series and parallel connection of resistors? Question Why are lattice vibrations called optical and acoustic? Question What is the difference between orbital and angular velocity?