The Professional Development Service for Teachers is funded by the Department of Education and Skills under the National Development Plan Photoelectric.

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© John Parkinson 1 MAX PLANCK PHOTOELECTRIC EFFECT.
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The Professional Development Service for Teachers is funded by the Department of Education and Skills under the National Development Plan Photoelectric Effect T.T.

PDST Resources for Leaving Certificate Physics Negatively Charged Electroscope Photoelectric Effect UV When UV shines on the cap… …the leaves collapse …showing the charge is gone

PDST Resources for Leaving Certificate Physics Positively Charged Electroscope Photoelectric Effect UV When UV shines on the cap… …nothing happens

PDST Resources for Leaving Certificate Physics 4 Photoelectric Effect A Electromagnetic radiation Circuit used to analyse circuit: Radio / μ-wave / IR / Visible / UV / X-ray / γ-ray Spectrum Low freq. High freq. threshold frequency f o Current flowsNo current Under f o (No current) Over f o (Current) Increase fNo effect Increase intensity No effectIncreases current (of varying frequency and intensity)

PDST Resources for Leaving Certificate Physics 5 Photoelectric Effect: Einstein’s explanation A Electromagnetic radiation Circuit used to analyse circuit: Light is a beam of particles (photons) Each photon hits one electron If the electron gains enough energy, it escapes The more electrons, the bigger the current electrons travel to the anode

PDST Resources for Leaving Certificate Physics 6 Photoelectric Effect: Einstein’s Photoelectric Law A Electromagnetic radiation Circuit used to analyse circuit: Energy in each photon Energy electrons need to escape (called the work function) Kinetic Energy Photon (containing energy, E in ) hits electron electron uses energy, Φ, to escape electron crosses gap with energy, E k

PDST Resources for Leaving Certificate Physics 7 Electromagnetic radiation Circuit used to analyse circuit: A Energy in each photon Energy electrons need to escape (called the work function) Kinetic Energy Photoelectric Effect: Einstein’s Photoelectric Law

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