PHOTOELECTRIC EFFECT

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PHOTOELECTRIC EFFECT
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Classical physics pre1900

• Particles and Waves
• Newtons Laws of force
• Wave nature of light (Maxwell)

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Modern Physics post 1900

• Quantum physics (Planck, Einstein, Schrodinger,
  Heisenberg, Pauli, Dirac, )
• Relativity (Einstein, Lorentz, Minkowski, Mach,
  )

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Whats photoelectric effect?

• UV light is shone on a metal, and electrons are
  released - photoelectrons

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Wave-Particle Duality

• Before 1900, light was understood as an
  electromagnetic wave
• In 1905, Einstein proposed that light could also
  exist in the form of particles
• A particle of light is a photon

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Energy of electron Ekin   h f W

• Ekin - maximal kinetic energy of an emitted
  electron
• h - Planck constant (6.626 x 10-34 Js)
• f - Frequency
• W - work function

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