CBSE Class 12-science Answered
Why is it easier to remove an electron from sodium than from copper. Which metal has higher value of threshold frequency?
Asked by tripathi.durba | 23 Feb, 2016, 11:22: PM
Expert Answer
The minimum energy required to remove an electron from the metal surface without giving any kinetic energy is called work function.
The work funciton of sodium is less than that of copper.
Therefore it is easier to remove an electron from sodium than from copper.
Work function, 
= hvo
= hvo Therefore, threshold frequency, vo = /h
/hThis implies that the threshold frequency of copper is more than that of sodium.
Answered by Yashvanti Jain | 24 Feb, 2016, 11:27: AM
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