Light knocks electrons out of metal surfaces as if it were made of particles --- photons.

For light of frequency f, each photon has energy hf.

• Implications
• Examples
• Study Questions

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The Photoelectric Effect - Implications

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• Frequency Dependence: Waves Fail
• Time Delay: Waves Fail Again
• Electron energies: Photons Work.
• Intensity Dependence: Photons Again

The Photoelectric Effect

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The Photoelectric Effect - Examples

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• Frequency Dependence: Waves Fail
• Time Delay: Waves Fail Again
• Electron energies: Photons Work.
• Intensity Dependence: Photons Again

The Photoelectric Effect

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The Photoelectric Effect - Questions

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• Frequency Dependence: Waves Fail
• Time Delay: Waves Fail Again
• Electron energies: Photons Work.
• Intensity Dependence: Photons Again

The Photoelectric Effect