How does the intensity of light effect photoelectrons?

Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter5: Electrons In The Atom
Section: Chapter Questions
Problem 56A
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How does the intensity of light effect photoelectrons?

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Step 1

Electronic spectroscopy –

  • It depends on the nature of energies emitted by electrons.
  • This technique is used to identify elements, structures from test sample.
  • Samples may be any of from solid, liquid and gas.
  • This technique is used for emission of photons, x-ray photons, ultraviolet radiation photons etc.
  • Photons are electrically neutral.
  • Photons have no mass, but they have energy.
Step 2

Answer of given question-

  • As number of photons increases intensity increases but energy of each photon will remains unchanged.
  • When more photons will remove more photoelectrons but there is no change in energy of photoelectron takes place.
  • Hence maximum energy of photoelectron will be independent on intensity of light.
  • Also as change of potential energy takes place stopping potential will not change.
  • So, number of photoelectron will be more in numbers so charge will be more so charging time will decrease with increase of intensity.
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