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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.
A linear combination of states that diagonalize the Hamiltonian
  • kajmunso
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Problem about dot product in probability density problem
  • Another
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12
Black Body Entropy: Solving the Puzzle of q and N
  • LCSphysicist
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3
Question about Lagrangian density
  • Another
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1
Feynman Rules on ##\phi^3, \phi^4## theory
  • JD_PM
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59
Bianchi and Ricci Identities: Understanding and Applying in Tensor Calculus
  • etotheipi
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4
Commutation and Measurement of Observables
  • Mr_Allod
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4
Harmonic Crystal and Bogoliubov trasformation
  • Satana
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1
Electrodynamics and the Poynting theorem
  • AHSAN MUJTABA
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What Is the Correct Expression for the Emitted Field?
  • MaestroBach
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What is the significance of Fermi Temperature?
  • Old Guy
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1
Check Inversion Symmetry: Honeycomb Kitaev Model
  • MatNiss
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1
Photoemission from a non-interacting electron gas
  • SQUB
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1
Linear chain of oscillators and normal coordinates
  • JTFreitas
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7
Semi-Empirical Mass and E=mc^2 close, but both off? Binding Energy calc
  • MagneticNeutron
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1
Thermodynamic meaning of molar Gibbs free energy
  • GranMix
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5
How to Solve the Advection Diffusion Problem Analytically?
  • jkthejetplane
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4
What Are the Values of \(a\) and \(b\) in the Schwarzschild 4-Velocity?
  • Omikron123
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10
How Long to Achieve Uniform Mixture in Helium Gas Experiment?
  • Jameskd
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1
Dirac-Hamiltonian, Angular Momentum commutator
  • JD_PM
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20
Plane pendulum: Lagrangian, Hamiltonian and energy conservation
  • hicetnunc
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6
The oscillation of a particle in a special potential field
  • Peter Jones
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2
Fermi Motion of Nucleons due to a Beam of Neutrinos
  • vintagelover007
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1
Evanescent Waves in near field for aperture > lambda (diffraction)?
  • PhDeezNutz
  • · Replies 50 ·
2
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50
Special relativity — Observer measuring the velocity of a passing rocket
  • LCSphysicist
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2
Fermions, Bosons, and nonidentical particles in a 1-d oscillator
  • MaestroBach
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4
How to Simplify the Covariant Derivative Transformation?
  • JTFreitas
  • · Replies 5 ·
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5
Extinction correction (photometry)
  • learningastronomy
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1
Assignment on the tight binding model
  • Satana
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1
Quantum Mechanics determining the normalized constant of a particle
  • tryingtolearn1
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2
Find the tensor that carries out a transformation
  • Frostman
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5
Problem about the derivation of divergence for a magnetic field
  • georg gill
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5
Scale Factor & ##\Omega##: Finding the Relation
  • AHSAN MUJTABA
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1
Electrostatics problem related to polarization and a cylindrical dielectric
  • AHSAN MUJTABA
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20
Separation of Variables: Find the potential b/w concentric hemispheres
  • ligneox
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2
Motion of particles close to the Earth
  • flyleaf_
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1
Heat Capacity of a Van Der Waals' gas in an Open system
  • Astrocyte
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6
Problems on magnetic vector potential
  • Tony Hau
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1
How Does Dipole Interaction Energy Vary with Orientation?
  • physconomic
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2
Evaluating a momentum operator
  • JD_PM
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4
Finding a unitary operator for quantum non-locality.
  • koroshii
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1
Lotka Volterra estimate parameters from experimental data
  • quantumCircuit
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15
Why Are Allowed Energy Levels Odd at ##x=0##?
  • tryingtolearn1
  • · Replies 11 ·
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11
Angle of reflection of a beam light on a moving mirror
  • Frostman
  • · Replies 20 ·
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20
Boundary Value and Separation of Variables.
  • zhuang382
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1
Difficulty with Lagrange multipliers in Kardar's Statistical Physics book
  • AndreasC
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4
Is the Heisenberg Picture Better for a Time-Dependent Hamiltonian?
  • Mayan Fung
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4
Energy of a particle in an Infinite square well?
  • zeus8olympus
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5
What happens to σ (conductivity) when the permitivity is negative?
  • FrankJ777
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Euler Lagrange equations in continuum
  • JD_PM
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The Harmonic Oscillator Asymptotic solution?
  • patric44
  • · Replies 21 ·
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21
Programming a Diffraction Pattern by the (pseudo?) method of images
  • PhDeezNutz
  • · Replies 39 ·
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39
Express this trajectory in terms of proper time
  • JTFreitas
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4
Calculate a specific boost and rotation
  • Frostman
  • · Replies 16 ·
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16
Proof of the generalized Uncertainty Principle?
  • patric44
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2
Help with 2nd order Runge Kutta and series expansion
  • jkthejetplane
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3
Finding the wave function when given the momentum eigenstate
  • tryingtolearn1
  • · Replies 21 ·
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21
Solving Poisson's equation ##\nabla^2\psi##
  • AHSAN MUJTABA
  • · Replies 30 ·
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Dimensional analysis of the Froude Number
  • Timburton91
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1
Griffiths Quantum Mechanics 2nd edition Chapter 8 equation is confusing
  • edfink1
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2
Normalize the eigenfunction of the momentum operator
  • LCSphysicist
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4
Showing that a state is unentangled under a certain condition
  • JD_PM
  • · Replies 10 ·
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10
What Is the Ground State Density Requirement in Quantum Mechanics?
  • dRic2
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9
Semiconductor (Diode) Lasers and Properties
  • dalye13
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2
General Relativity: How many Christoffel symbols?
  • AHSAN MUJTABA
  • · Replies 4 ·
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4
Harmonic oscillator with ladder operators - proof using the Sum Rule
  • chocopanda
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4
Finding the generator of rotations for a 3-state triangle
  • PhysicsKush
  • · Replies 3 ·
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3
In 2 consecutive decays, determine max and min energies for a particle
  • peguerosdc
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1
Quantum Mechanics: creation and annihilation operators
  • chocopanda
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3
A strange wave function of the Hydrogen atom
  • omegax241
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5
MTW Ex 21.23 Poynting Flux Vector 'out of the air'
  • TerryW
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1
Schrodinger equation in three dimensions. Atom with one electron.
  • LCSphysicist
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2
Mass difference due to electrical potential energy
  • Adams2020
  • · Replies 40 ·
2
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40
Question about the classic Image Problem
  • zhuang382
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3
How can I find conserved current for a Lagrangian involving vector fields?
  • phywithAK
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8
A special case of the grand canonical ensemble
  • Ted Ali
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1
Perturbation from a quantum harmonic oscillator potential
  • Mayan Fung
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2
Spin probability of a particle state
  • Zack K
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1
Working out ##\big[\varphi (x) , \varphi (0) \big]## commutator
  • JD_PM
  • · Replies 7 ·
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7
Potential inside a uniformly charged solid sphere
  • agnimusayoti
  • · Replies 42 ·
2
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42
Prove that phase-conjugate waves satisfy Maxwell's equations
  • Haorong Wu
  • · Replies 8 ·
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8
Asymmetric beam torsion balance with shear flow
  • tracker890 Source h
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1
Why does a symmetric wavefunction imply the angular momentum is even?
  • mjmnr3
  • · Replies 6 ·
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6
Equations of relative motion with respect to a rotating reference frame
  • Master1022
  • · Replies 7 ·
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7
Delta function for \nabla(log s), where s = \sqrt{x^2+y^2}
  • zhuang382
  • · Replies 2 ·
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Minimal substitution on the Lagrangian of the complex KG field
  • JD_PM
  • · Replies 1 ·
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Why Does the Potential Energy of the Wedge Appear in Lagrangian Mechanics?
  • Another
  • · Replies 5 ·
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5
Why the Stern-Gerlach experiment didn't detect the L?
  • patric44
  • · Replies 4 ·
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4
Atmospheric pressure as a function of altitude
  • Karl Karlsson
  • · Replies 15 ·
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15
Modifying photon states to get a gauge symmetry
  • JD_PM
  • · Replies 7 ·
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7
Verifying that the uncertainty is 0 for a QM state
  • PhysicsKush
  • · Replies 8 ·
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8
Gross Pitaevskii one dimensional solution
  • Yoris21
  • · Replies 2 ·
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2
Exponential Wavefunction for Infinite Potential Well Problem
  • a1234
  • · Replies 7 ·
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7
Method of image with Green function
  • hubrisos
  • · Replies 5 ·
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5
Probability of a state given the partition function
  • Sat D
  • · Replies 5 ·
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5
Lagrangian mechanics, system of a spring and a pendulum
  • TimmyD1
  • · Replies 21 ·
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21
Interpreting a thermodynamics formula using a picture
  • PhysicsKush
  • · Replies 11 ·
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11
Divergence of a radial field ##F=\hat{r}/r^{2+\varepsilon}##
  • PhysicsKush
  • · Replies 10 ·
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10
Electric field a distance z from the center of a spherical surface
  • agnimusayoti
  • · Replies 26 ·
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26
Electric Field Above a Square Loop with Linear Charge Density?
  • Vaentus
  • · Replies 11 ·
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11