Which one is correct relation for thermionic emission
A$J=A T^{1 / 2} e^{-\phi / k T}$
B$J=A T^2 e^{-\phi / k T}$
C$J=A T^{3 / 2} e^{-\phi / k T}$
D$J=A T^2 e^{-\phi / 2 k T}$
[RPMT 2000]
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B$J=A T^2 e^{-\phi / k T}$
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