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CHEM 111 (69)

Photoelectric effect

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Colorado State University
CHEM 111
Dana Johnson

8 September Announcement ALEKS assessment vs. objective completion Review J. J. Thomas – cathode rays showed the existence of a particle smaller than the atom, called electrons Ernest Rutherford – gold foil experiment showed the atom to be mostly empty space with the positive charge concentrated to the nucleus, electron made up rest of the volume Simple picture of the atom: particle electrons somehow circled around the nucleus, electron cloud simply constructed Problems: opposite charges attract, to keep a particle orbiting would take constant energy The electron must behave differently than expected Interaction between light and matter began to explain how electrons behave in an atom Light waves: arranged in a continuum of λ and ν, behave as expected for waves (refract, diffract, interfere), c =λν Blackbody radiation: matter only absorbs or emits light in discrete units, called quanta, does NOT absorb the continuous spectrum, E = nhν (or E = hν) → the electrons must be arranged in energy levels rather than a simple cloud Photoelectric effect How it works: light shining on a metal plate causes current by adding energy to free electrons Expectations #1 → any light waves would eventually d
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