Question:medium
Which one of the following is the correct graph between the maximum kinetic energy (\( K_m \)) of the emitted photoelectrons and the frequency of incident radiation (\( \nu \)) for a given photosensitive surface?
\includegraphics[width=0.5\linewidth]{10o.png}
Which one of the following is the correct graph between the maximum kinetic energy (\( K_m \)) of the emitted photoelectrons and the frequency of incident radiation (\( \nu \)) for a given photosensitive surface?
\includegraphics[width=0.5\linewidth]{10o.png}
\includegraphics[width=0.5\linewidth]{10o.png}
Show Hint
Always check for the presence of a threshold frequency in photoelectric effect graphs, as it marks the minimum frequency required to emit electrons from the material, which should be clearly represented.
Updated On: Jan 13, 2026
Show Solution
The Correct Option is C
Solution and Explanation
The Einstein’s photoelectric equation, \( K_m = h u - \phi \), demonstrates that the maximum kinetic energy (\( K_m \)) of emitted photoelectrons is zero at the threshold frequency. Above this frequency, \( K_m \) increases linearly with the incident radiation's frequency (\( u \)). The graph in option (C) accurately depicts this relationship, commencing at zero at the threshold frequency and rising linearly.
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