Planck's Constant h from the Photoelectric Effect

V_stopping(f): slope dV/df = h/e. Fit V vs f; h = e·slope.

Goal

Recover h in J·s from the linear fit (simulated hν data).

Photoelectric: eV_s = h f − W; for V in volts, dV/df = h/e.

Use frequencies above the cutoff (model work function ≈ 2 eV); V_s stays positive.
Vary f, record V_s (small noise); linear fit V_s vs f gives slope h/e.

Stay above the model cutoff; fit V_s vs f, h = e·slope.

V_s (ideal, no noise) ≈ 0.275 V

f (Hz)5.50e+14

№	f (Hz)	V_s (V)
No measurements yet — take your first reading.

Add at least 2 measurements to compute the fit.

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Generated: 28 May 2026, 02:05

Recover h in J·s from the linear fit (simulated hν data).

#	f (Hz)	V_s (V)
No measurements yet — take your first reading.

Add at least 2 measurements to compute the fit.

h agrees with the accepted value within tolerance.

PhysSandbox virtual lab — values come from your session; add your own discussion of error sources.

h agrees with the accepted value within tolerance.