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Physics Paper 2, Nov/Dec. 2013  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments
Weakness/Remedies
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Question 8

   Question 8
   Explain ‘threshold frequency’ with respect to photoemission.
    This is not a popular question among the candidates.  Most candidates missed   out the key words like minimum frequency; appropriate frequency.  Hence they could not score.

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comments

This question was avoided by many candidates.  Very few candidates were at best able to mention diffusion.  Performance was poor.
The expected answers are
 Kinetic theory of gases                                           
  Gas pressure                                                                                              

  Diffusion                                                                                         
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