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COMEDK2021PhysicsDual 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 depends linearly on the frequency
  3. Cthe stopping potential are different for Na and Al for the same change in frequency
  4. DAl is better photosensitive material than Na

Correct answer

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

Step-by-step solution

From Einstein's photoelectric equation: eV_s = h - V_s = h e - e This is a linear equation in with slope h e , which is universal (same for all metals). (1) Na and Al have different x-intercepts different threshold frequencies. So (1) is incorrect. (2) K_ max = h - , which is linear in for any metal. So (2) is correct. (3) Slope is the same for both same change in V_s for same change in . So (3) is incorrect. (4) Na has a lower threshold frequency Na is more photosensitive than Al. So (4) is incorrect. Correct opti

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