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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