

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) | |