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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
    • History of QM
      • “Old Quantum Theory”: Planck, Einstein, and Bohr
      • Matrix Mechanics: Born, Jordan, Heisenberg
      • Derivation of Schroedinger’s Equation
      • All Together Now: Dirac and von Neumann
      • Relativistic Theory and Quantum Fields
      • Later Developments
    • General Structure
      • States and Observables
        • Observables
          • Why Symmetry is not enough
        • States
          • States – Pure, Mixed, & Entangled
            • EPR, Bell, and All That
              • Collected References on EPR, Bell, etc.
      • Measurement in Quantum Mechanics
        • Quantum Measurement Process
        • Quantum Measurement Process
        • Measurement
        • Schroedinger’s Cat is Wigner’s Friend
      • Path Integrals
        • Path Integrals
      • Interpretations
        • Interpretation Debates
  • Atmospheric Greenhouse Effect
    • Greenhouse Saturation
      • The Angstrom Argument
    • Human Energy Consumption
      • Society
  • Online Physics Resources
  • The Blog
    • Archives

Recent Posts

  • What is the reason that carbon dioxide is a good absorber of infrared radiation but not as good an emitter of infrared radiation? 
  • Another Twins Answer
  • What’s wrong with saying “General relativity says that the orbiting clocks should tick about 45 millionths of a second faster than they would on Earth”?
  • Is it wrong to assert that a GPS satellite clock runs slower due to kinematical time dilation?
  • In the twin paradox it is often stated that the clocks can only be compared at the same location. Why can’t the clocks be compared at space stations synchronized with the earth clock on the travelling twin’s journey? 

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