Momentum Of A Photon — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Momentum of a photon Applies to photons and other massless particles moving at the speed of light. Start with Einstein mass-energy equivalence E=mc 2 Define momentum p=mc for a photon Combine to get p=E/c Use E=hc/lambda to derive p=h/lambda Photon rest mass must be zero Applicable for electromagnetic waves in vacuum Assuming photons have rest mass like matter particles Confusing the momentum of a photon with the momentum of a particle with mass p=mv where v<c