Photoelectron rate and saturation photocurrent (I_sat ∝ I_light (for ν > ν₀); K_max independent)

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I_sat ∝ I_light (for ν > ν₀); K_max independent of I_light

What each symbol means

SymbolWhat it stands for
νFrequency (must exceed ν₀)
I_satSaturation photocurrent (A)
I_lightIncident light intensity (W/m²)

When to use this

Each photon ejects at most one electron (one-to-one at ordinary intensities); more photons per second ⇒ more photoelectrons ⇒ higher saturation current. K_max fixed by ν.