A) \[{{T}^{2}}\]
B) \[{{T}^{1/2}}\]
C) \[{{T}^{3/2}}\]
D) \[{{T}^{4}}\]
Correct Answer: A
Solution :
According to Richardsons equation, \[I=A{{T}^{2}}\,{{e}^{-b/T}}\] (Thermionic current) \[I\propto {{T}^{2}}\]
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