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Physics Paper 2, Nov/Dec. 2009  
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 9
Part I:      Candidates were required to answer any five questions from this part.

Explain threshold frequency with respect to photoemission.

   

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Observation

This question was well tackled by many candidates.  However, few failed to recognize that minimum frequency is a salient point in their statement.

The expected answer is:

When radiation of appropriate frequency falls on a metal surface, electrons are ejected from the surface.  The minimum frequency of a radiation that must be incident on the metal surface to liberate/set free electrons from the surface is the threshold frequency.  

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