The maximum electron current per unit area provided by an emitter is g – McqOptions

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1.	The maximum electron current per unit area provided by an emitter is given by (where J=current density, T=absolute temperature in K, ɸ=work function in keV, k=Boltzmann's constant & A=emission constant)
A.	J= AT exp(-ɸ/kT)
B.	J= AT (-ɸ/kT)
C.	J= AT2 exp(-ɸ/kT)
D.	J= exp(-Aɸ/kT2)
Answer» D. J= exp(-Aɸ/kT2)

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