Advanced Physics Homework Help Forum

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Free advanced physics homework help via qualified mentors. Upper undergraduate and graduate level. Please use the template when requesting help and show your work.
Comoving Distance in LCDM - Understanding an Approximation
  • Arman777
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Why heat PDE solution does not fully satisfy initial conditions?
  • ujo142
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Infinite square well centered at the origin
  • Kaguro
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Donor and Acceptor Concentrations in a Si speciment
  • lelouch_v1
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Total Josephson current through junction with magnetic field
  • Mr_Allod
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Hund's Rule for Determining Term Symbol Energy Order
  • Mr_Allod
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Does anyone know which are Ricci and Riemann Tensors of FRW metric?
  • physicsuniverse02
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2
How do I normalize a wavefunction with Cn instead of Ci and Cj?
  • SinaHp
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Lagrangian with a charged, massive vector boson coupled to electromagnetism
  • jaded2112
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The magnetic phase change of an electromagnetic wave during reflection
  • Dom Tesilbirth
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Need of Tangle calculation using code and Numerically
  • Appu
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What is the Relationship Between Concurrence and Three Tangle in Quantum States?
  • munirah
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State space controllers - find equations from differentials
  • Maniac_XOX
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12
Hermiticity of AB where A and B are Hermitian operator?
  • Haynes Kwon
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11
Calculate Earth's escape velocity using different methods
  • Physicsdudee
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8
Spectral Intensity Formula by Using Frequency
  • benagastov
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5
Landau Energy Spectrum in the non-relativistic limit
  • desperate_student
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Solving Freidman Equation on MATLAB
  • WoC1994
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A wheel rolls down a flat inclined surface
  • alefisico
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8
Finding Total Number of Optical Field Modes for Visible Light
  • freddie123
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2
Proof of Schrodinger equation solution persisting in time
  • e4c6
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5
Quantum Harmonic Oscillator with Additional Potential
  • Mr_Allod
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1
Spin matrix representation in any arbitrary direction
  • PhysicsTruth
  • · Replies 16 ·
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16
Commutation relations between Ladder operators and Spherical Harmonics
  • PhysicsTruth
  • · Replies 6 ·
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6
How Do Radial Oscillations Affect Star Stability?
  • ergospherical
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4
What Are the Electric Field Components at a Charge Density Boundary?
  • Sebas4
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Computing the infinitesimal generators for the Mobius transformation
  • platypi
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Green's reciprocity theorem about current density and magnetic field
  • SanaiBongchul
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How Are Wigner D Functions Related to Nuclear Rotor Model Wave Functions?
  • patric44
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Coding of Spin Spin correlation function
  • woodydewar
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15
How Can I Effectively Structure a 1500-Word Essay on Quantum Magnetism?
  • GiuliettaL
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Show that ##B = \nabla \times A = 0## using Ampere-Maxwell law
  • happyparticle
  • · Replies 23 ·
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Length of spin vector for spin-½ particle
  • ghbeefcake
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Question regarding a decay spectrum graph
  • dark_nebula
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Lagrangian of a double pendulum, finding kinetic energy
  • P Felds
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Deriving the Solution to $$\frac{\partial}{\partial \phi^{*}}$$
  • Irishdoug
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Diagonalizing q1ˆ3q2ˆ3 with Degenerate Perturbation Theory
  • ThiagoSantos
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Why Do My T1 and T2 Values for Mineral Oil Show Significant Errors?
  • Bryan278
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Expectation Values <E> and <E^2>
  • a1234
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6
How Does the Nuclear Quadrupole Moment Explain Nucleus Deformation?
  • patric44
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Help with this Commutator question please
  • Clifford Williams
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Renormalization Group:NiemeijerVan Leeuwen Method-Ising Square Lattice
  • lapantufla
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How to tell if Energy is Conserved from the Lagrangian?
  • penguin46
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Deriving Wave Function: Confused about (ix/a) & (-x^2/2a)?
  • sus1234
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4
A question on the definition of the curl of a vector
  • user1139
  • · Replies 9 ·
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9
Finding Lorentz acceleration transformation for arbitrary direction
  • Cyneron
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2
Showing that the gradient of a scalar field is a covariant vector
  • AndersF
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5
What would be the Wigner-Seitz cell of this lattice?
  • pepediaz
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Cancellation of terms, Kittel (first edition) equation 6.4
  • Irishdoug
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Calculating the half-life of decays of Radium-224
  • Demon117
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5
MTW Ex 21.15 - Curvature independent of Lapse and Shift functions
  • TerryW
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How is the Power Spectrum of Matter Density Field Defined?
  • SherLOCKed
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How to find integrals of motion for a particle on a surface?
  • penguin46
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Derivation of Boltzmann Factor via Reservoir Method (canonical ensemble)
  • yucheng
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4
Scattered State Solutions of a Repulsive Dirac Delta Potential
  • PhysicsTruth
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Finding all possible energy states faster without using a calculator
  • benagastov
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Confused about the nature of Laplace vs Poisson equation in BVP
  • yucheng
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11
How to prove ##V_{ai;j}=V_{aj;i}## in curved space using the given equation?
  • user1139
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Fresnel diffraction from square: on axis intensity
  • ergospherical
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Watt Rotational Speed Regulator's Lagrangian
  • Hari Seldon
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6
How to determine the minimum grid length | Numerical Plasma Physics
  • JD_PM
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Understanding Exponential Terms in Quantum Mechanics Problem
  • NightHaWk
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Capacitance of infinitely long coaxial cylinders of elliptical section
  • Rlwe
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Notation clarification: SU(N) group integration
  • paralleltransport
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Calculation of the Berry connection for a 2x2 Hamiltonian
  • Silicon-Based
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Converting an expression of a particular k-mode to the spatial domain
  • ian_dsouza
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What Is the Variational Method's Role in Determining Energy Expectation Values?
  • Ashkan95
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Potential of a charged ring in terms of Legendre polynomials
  • patric44
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What is the function to extremise for finding geodesics on a Helicoid?
  • jayzhao
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Total Momentum Operator for Klein Gordon Field
  • Samama Fahim
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Michelson Interferometer with a lens
  • zefanya
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Fourier transform radial component of magnetic field
  • Swordwhale
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Help with variation of the 3-dimensional ##\sigma##-model action
  • user1139
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Diagonalizing of Hamiltonian of electron and positron system
  • Davidllerenav
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Why must the second term on the right-hand side vanish in string theory?
  • StenEdeback
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Understanding Powder Behavior under Centrifugal Force
  • Asdr
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Statistical physics, using the ideas of Fermi Energies, etc. for a star
  • Benlaww
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Dependence of the stress vector on surface orientation
  • AndersF
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Discretizing a 1D quantum harmonic oscillator, finding eigenvalues
  • JTFreitas
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Calculating Amplitude in Standard Model
  • ultrapoci
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Perturbation Theory: Calculating 1st-Order Correction
  • ooleonardoo
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Confirming the dimension of induced charge density of a dielectric
  • patric44
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How does spin magnetization affect energy configurations in non-ideal systems?
  • Marioweee
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Feynman rules and the tree level cross section of two scalar fields
  • MT777
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Using Variational Principle to solve ground state energy
  • 1missing
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Particle in a box: Finding <T> of an electron given a wave function
  • Mayhem
  • · Replies 9 ·
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9
Help with a calculation about gravitational waves
  • user1139
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Schwarzchild metric - rescaled coordinates
  • radiogaga35
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Vector calculus — Computing this Divergence
  • jorgeluisharo
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Time dependent perturbation theory (Berry phase)
  • dRic2
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Bethe formula dependence on charge of the material
  • pepediaz
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Finding transition temperature of Landau ferroelectric
  • baseballfan_ny
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Mass conservation in a sphere to find radial velocity of a flame
  • Andrew1235
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Show that an expected value of a vacuum state is equal to 1
  • mcas
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Delta function to calculate density of probablity
  • anaisabel
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Bragg curve -> observing dependence on velocity
  • pepediaz
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Deriving the Laplacian in spherical coordinates
  • Mayhem
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Space-like trajectory in Schwarzschild spacetime
  • crime9894
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Possible Results and Probabilities of a Measurement of Operator Q
  • koil_
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The Cooper Problem in tight binding
  • mcas
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1