The Graph Shows the Stopping Potential for Photoelectrons as a Function

question 90

Multiple Choice

The graph shows the stopping potential for photoelectrons as a function of the frequency of the incident light for two different metals (Cs and W) . Which of the following statements is true?

• A) Because the intercepts are different, Planck's constant is not constant.
• B) For a given frequency of incident light, the photoelectrons from W are more energetic than those from Cs.
• C) The maximum kinetic energy of the photoelectrons increases as the frequency of the incident light increases.
• D) The stopping potentials for all metals are the same.
• E) The threshold frequency for Cs is greater than that for W.

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