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CBSE Class 12-science Answered

Why is it difficult to remove a free electron from copper than sodium? Which has higher threshold wavelength?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer

The work function of copper is 4.5 eV while that for sodium is 2 eV. Therefore, radiation of more energy is required to remove a free electron from copper as compared to sodium. Since threshold radiation is inversely proportional to the work function, its value will be more for sodium.

 
Answered by | 04 Jun, 2014, 03:23: PM
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