Class 12 Physics simulations · Dual Nature of Radiation and Matter

Photocell current vs anode voltage

Vary the anode voltage of a photocell. Intensity sets the saturation current; frequency sets the stopping potential.

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What to notice

Brighter light raises the plateau but leaves the stopping potential unchanged.

Key relation

eV₀ = hf − φ ; I_sat ∝ intensity

Try this

Double the intensity, then raise the frequency instead.

What you can change

• Light frequency: 4 to 15 × 10¹⁴ Hz
• Intensity: 0 to 100 %
• Cathode: choose Sodium (φ = 2.28 eV), Caesium (φ = 2.14 eV), Zinc (φ = 4.31 eV), Copper (φ = 4.70 eV)
• Anode voltage: -5 to 10 V

More in Dual Nature of Radiation and Matter

• Compton scattering
• Matter-wave wavelength
• Electron diffraction from a crystal
• Photoelectric effect
• Stopping potential vs frequency

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