Photoelectric Effect Simulator – AP Physics 2

The Math

$$ K_{max} = hf - \Phi $$ $$ E = \frac{hc}{\lambda} $$

Key Thresholds

E < Φ : No electrons ejected, regardless of light intensity. This proved classical wave theory wrong.

E > Φ : Electrons ejected immediately. Higher freq = faster electrons.

Intensity : Increases the number of electrons (Current I), but not their max energy.

Stopping Potential: Voltage to exactly stop the fastest electrons ($eV_s = K_{max}$).

Tags

quantumphotonwork functionkinetic energy

Quantum Readings

Photon Energy ($E$):
Work Function ($\Phi$):

Max Kinetic ($K_{max}$):
Stopping Potential ($V_s$):

Ammeter Current ($I$) 0.00 A

Target Metal

Light Wavelength ($\lambda$)

Light Intensity

Battery Voltage (V)

Negative voltage creates an electric field pushing electrons back to the cathode. Adjust it to find the exact stopping potential required to zero the current.