13 how the photoelectric effect works if light shines

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Unformatted text preview: called a ____________ which has an energy E = hλ. 13 How the photoelectric effect works: • If light shines on a metal there is a point at which electrons are ejected from the metal. it differs for different materials. Alkaline metalsvisible range other metals- near UV range. • The electrons will only be ejected once they have a certain minimum frequency called the threshold frequency, νo. • If a photon is below the threshold frequency, no electrons will be ejected. non metals- extreme UV. • If a photon is above the threshold frequency, an electron will be ejected and any excess energy will be used as kinetic energy for the electron. KEelectron = ½ mv2 = hvphoton - hv0 • Above the threshold frequency, the number of electrons ejected intensity depends on the _____________ of the light. absorption spectrum and emission spectrum of elements. • Let’s ask someone to explain this 14 7 05-Sep-13 Bohr’s Model of the Hydrogen Atom At the beginning of this lecture we looked at the emission spectrum of the simplest atom - Hydrogen: Question: How do we explain these lines? Answer: Niels Bohr suspected that t...
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