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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
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
KEelectron = ½ mv2 = hvphoton - hv0
• Above the threshold frequency, the number of electrons ejected
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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