Einstein photoelectric equation (hν = φ + K_max)

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hν = φ + K_max

What each symbol means

SymbolWhat it stands for
φWork function of metal
V_sStopping potential (K_max = eV_s)
Photon energy
K_maxMaximum kinetic energy of photoelectrons

When to use this

Threshold frequency ν₀ = φ/h; one photon ↔ one electron (particle picture).