A) equals \[3{{E}_{k}}\]
B) is greater than \[3{{E}_{k}}\]
C) is less than \[3{{E}_{k}}\]
D) may be equal to, less than or, greater than \[3{{E}_{k}}\]
Correct Answer: B
Solution :
[b] We write Einstein's equation for the photoelectric effect, \[hf-W={{E}_{K}}\] ....(i) \[3hf-W=E{{'}_{K}}\] ...(ii) From (i) and (ii), we get, \[E{{'}_{K}}-3{{E}_{K}}=2W>0.\]
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