basic

Photoelectric Effect: Stopping Potential and Max Kinetic Energy Calculator

KE_max = hf − φ — Einstein's photoelectric equation.

Calculates the maximum kinetic energy of emitted electrons: KE_max = hν − φ, where h = 6.626×10⁻³⁴ J·s, ν is the photon frequency, and φ is the work function. Also gives stopping potential V_s = KE_max/e.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Hz
eV

Results

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

KE_max = hν − φ; V_s = KE_max / e

In depth

Calculates the maximum kinetic energy of emitted electrons: KE_max = hν − φ, where h = 6.626×10⁻³⁴ J·s, ν is the photon frequency, and φ is the work function. Also gives stopping potential V_s = KE_max/e.