Mech And Photoelectric Energy Bar Charts Page 2
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2Photoelectric Effect:
The diagram below shows a photoelectric circuit with 3 photons of different amounts of energy represented by the
number of blocks. The system is defined as the photon and the excited electron in the metal plate due to the
collision with a photon. The dotted line represents the minimum energy needed to overcome the binding energy in
order to emit an electron from the metal plate. Fill in the final energy for each set of bar charts.
B
C
A
Initial Energy
Final Energy
Kinetic Energy of
emitted electron
Photon A
Excitation Energy
E
E
E
E
photon
e‐
photon
e‐
Initial Energy
Final Energy
Kinetic Energy of
emitted electron
Photon B
Excitation Energy
E
E
E
E
e‐
photon
e‐
photon
Initial Energy
Final Energy
Kinetic Energy of
emitted electron
Photon C
Excitation Energy
E
E
E
E
photon
e‐
photon
e‐
1. Which photon/s caused an electron to be emitted from the metal plate? How do you know?
2. If a photon with a greater energy than C collided with an electron, how would it affect the final energy of the
electron? Explain your answer.
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