The threshold wavelength for emission of electrons from a given metal surface
Consider the given table Metals Threshold frequency ...
A metal has a threshold wavelength fo `6000 Å`. Calculate (i) threshold
A and B are two metals with threshold frequencies 1....
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2.4.2 Threshold Frequency & Work Function
The Work Function. The work function Φ, or threshold energy, of a material, is defined as: The minimum energy required to release a photoelectron from the surface of a metal. Consider the electrons in a metal as trapped inside an ‘energy well’ where the energy between the surface and the top of the well is equal to the work function Φ.
Photoelectric Effect
1) Compare the metals and threshold frequencies in the table above. Develop a hypothesis for why different metals would have different threshold frequencies – why is more energy required to liberate platinum electrons than sodium electrons? Explain in a few sentences. 2) How can you test or build support for your hypothesis? Conclusion
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The Work Function. The work function Φ, or threshold energy, of a material, is defined as: The minimum energy required to release a photoelectron from the surface of a metal. Consider the electrons in a metal as trapped inside an ‘energy well’ where the energy between the surface and the top of the well is equal to the work function Φ.
1) Compare the metals and threshold frequencies in the table above. Develop a hypothesis for why different metals would have different threshold frequencies – why is more energy required to liberate platinum electrons than sodium electrons? Explain in a few sentences. 2) How can you test or build support for your hypothesis? Conclusion