Thomson also experimented with shining ultraviolet light at metal electrodes, such as zinc, to produce cathode rays (i.e., beams of electrons). The minimum energy required to eject one electron from zinc is 6.94 × 10/7$ J. a) Based on the information above, what is the maximum wavelength of light that can be used to eject an electron from zinc (Zn)? Clearly show what equation(s) and values you used to calculate this energy.  b) In the space below, draw a graph of kinetic energy of ejected electrons (J) vs. photon energy (J). Label your axes and the threshold energy.  c) Explain how your graph appropriately represents the relationship between electron KE, photon energy, and threshold energy as demonstrated by the photoelectric effect.

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter4: Introduction To Quantum Mechanics
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Thomson also experimented with shining ultraviolet light at metal electrodes, such as zinc, to produce cathode rays (i.e., beams of electrons). The minimum energy required to eject one electron from zinc is 6.94 × 10/7$ J.


a) Based on the information above, what is the maximum wavelength of light that can be used
to eject an electron from zinc (Zn)? Clearly show what equation(s) and values you used to calculate this energy. 

b) In the space below, draw a graph of kinetic energy of ejected electrons (J) vs. photon
energy (J). Label your axes and the threshold energy. 

c) Explain how your graph appropriately represents the relationship between electron KE,
photon energy, and threshold energy as demonstrated by the photoelectric effect.

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