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The graph shown below represents the variation of the stopping potential with frequency of incident radiation in the photoelectric effect. Which of the following statements is true regarding this graph?
The slope of the graph represents the ratio of Planck's constant to the charge of an electron.
The y-intercept of the graph represents the work function of the material.
The stopping potential is independent of the frequency of the incident radiation.
The graph represents the variation of the photoelectric current with the intensity of the incident radiation.
Answers (1)
The graph shown represents the variation of the stopping potential with the frequency of incident radiation in the photoelectric effect. The stopping potential is the minimum potential difference required to stop the photoelectrons emitted from a material surface when it is exposed to electromagnetic radiation of a certain frequency. The y-intercept of the graph represents the stopping potential when the frequency of incident radiation is zero. This value is equal to the ratio of the work function of the material to the charge of an electron, the work function of the material is the minimum energy required to remove an electron from the surface of the material. Therefore, option B is incorrect. Option A is correct because the slope of the graph represents the ratio of Planck's constant to the charge of an electron. Option C is incorrect because the stopping potential is dependent on the frequency of the incident radiation, as shown by the linear increase of the stopping potential with frequency in the graph. Option D is incorrect because the graph does not represent the variation of the photoelectric current with the intensity of the incident radiation.
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