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Physics Notes

Just another alQpr Sites site

  • Preface
  • Math Prereqs
    • A Note on Dimensional Analysis
    • Vectors and Tensors
      • tensors2 – fromQuora
  • Classical Mechanics
    • Classical Mechanics
    • Module 1
    • Module 2
    • Module 3
    • V.Toth on Hamiltonian vs Lagrangian
  • ElectroMagnetism
    • Electro-Magnetism
  • Relativity
    • Relativity
      • Special Relativity
        • Derivations
          • From First Principles
          • From Electromagnetism
          • From Speed of Light
        • Contraction vs Dilation
        • Puzzles and Paradoxes
          • The Ladder Paradox
          • Twin Paradox
            • Acceleration
          • Ehrenfest Paradox
        • Graphical Simulation
        • Dynamics
      • General Relativity
        • Gravity
          • On the Approach to a Black Hole
            • Part I – Falling onto the event horizon
              • Lemma 1- red shift gradient for a point mass
            • Part 2 Evolution to Black Hole of a Large Gas Ball
              • Lemma 2 – Red Shift Gradient Inside a Gas Ball
  • Quantum Theories
    • Quantum Mechanics
      • History of QM
        • Planck, Einstein, and Bohr
        • Schroedinger, Heisenberg, and Dirac
        • Derivation of Schroedinger’s Equation
        • Relativistic Theory
        • Relativistic Theory and Quantum Fields
        • Later Developments
      • States and Observables
        • States
        • Observables
          • Why Symmetry is not enough
      • Interpretations
        • Interpretation Debates
      • Measurement in Quantum Mechanics
        • Quantum Measurement Process
        • Quantum Measurement Process
        • Measurement
        • EPR, Bell, Entanglement And All That
        • EPR, Bell, etc.
          • Pure, Mixed, & Entangled States
          • Schroedinger’s Cat is Wigner’s Friend
        • Path Integrals
          • Path Integrals
  • Atmospheric Greenhouse Effect
    • Greenhouse Saturation
      • The Angstrom Argument
    • Human Energy Consumption
      • Society
  • Online Physics Resources
  • The Blog
    • Archives

Recent Posts

  • Entanglement
  • Is special relativistic time dilation a real effect or just an illusion? Given two inertial frames each observer finds that the clock of the other runs slower than that observer’s own clock. So who is right? 
  • (3) Alan Cooper’s answer to How can a moving/faster observer see a ‘stationary’ clock running slower, when it doesn’t, e/specially when his really does? All the YouTube videos about the Twin Paradox say so. In what sort of universe is that possible? – Quora
  • (3) Alan Cooper’s answer to How does the twin (clock) paradox (in SR) really work? Please see the comment for the specific case. – Quora
  • (3) Alan Cooper’s answer to What is the Calabi-Yau manifold? Are we ‘inside’ it right now or is it just a mathematical concept? – Quora

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