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COMEDK2017PhysicsDual Nature of Matter

From the figure describing photoelectric effect we may infer correctly that

Options

  1. ANa and Al both have the same threshold frequency
  2. BMaximum kinetic energy for both the metals depend linearly on the frequency
  3. CThe stopping potentials are different for Na and Al for the same change in frequency
  4. DAl is a better photo sensitive material than Na

Correct answer

B. Maximum kinetic energy for both the metals depend linearly on the frequency

Step-by-step solution

According to given figure, the graph between stopping potential and frequency is a straight line, therefore stopping potential (V₀ ) and hence maximum kinetic energy (K_ =e V₀ ) of photoelectrons depends linearly on the frequency. Since, threshold frequency for Na is less than that of for Al, therefore work function for Na will be lesser than that of Al. Hence, Na is better photosensitive material than Al .

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