The Photoelectric Effect - smart phone physics

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  • Created by: Mal
  • Created on: 19-03-14 12:45
Preview of The Photoelectric Effect - smart phone physics

First 52 words of the document:

Introduction
Forget about electron
energy levels for this topic.
The Photoelectric Effect
only works on electrons
which have already been
knocked out of their
atomic orbits but are still
inside the material (i.e.
free or "delocalised"
electrons).

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Page 2

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Photoelectric
Effect
VIDEO
...of a simulation of the
Photoelectric Effect.…read more

Page 3

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Overview
Electromagnetic radiation
(EMR) of sufficiently high
energy can cause
delocalised (i.e. free)
electrons to leave the
surface of a suitable
material.…read more

Page 4

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Importance
The Photoelectric Effect is
an important piece of
evidence which proves the
Photon Model of Light.
The Wave Model of Light
cannot explain the effect.…read more

Page 5

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Photoelectric
Effect
Electrons which gain
sufficient K.E. from EMR
photons to escape the
material are called
Photoelectrons. (i.e.…read more

Page 6

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Photoelectric
Equation
hf = + Ek(max)
hf is the energy the
incoming photon (which
gets absorbed by one
electron)
is the Work Function.
Ek(max) is the maximum
Kinetic Energy of the
ejected Photoelectron.…read more

Page 7

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Photoelectric
Equation
hf = + Ek(max)
is the Work Function.…read more

Page 8

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Photoelectric
Equation
hf = + Ek(max)
If hf < then no electron
will be able to leave the
material surface, no
matter how intense the
photon source…read more

Page 9

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Photoelectric
Equation
hf = + Ek(max)
If hfo = then
photoemission is about to
begin. The frequency of
the photon is called the
Threshold Frequency (fo).
Again, intensity changes
have no effect.…read more

Page 10

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Photoelectric
Equation
hf = + Ek(max)
If hf > then
photoelectrons will be
emitted with a range of
kinetic energies up to a
maximum value given by
Ek(max)…read more

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