The maximum electron current per unit area provided by an emitter is given by (where J = current density, T = absolute temperature in K, = work function in keV, k = Boltzmann s constant & A=emission constant)

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

1.	The maximum electron current per unit area provided by an emitter is given by (where J = current density, T = absolute temperature in K, = work function in keV, k = Boltzmann s constant & A=emission constant)
A.	J = AT exp(- /kT)
B.	J = AT (- /kT)
C.	J = AT2 exp(- /kT)
D.	J = exp(-A /kT2)
Answer» D. J = exp(-A /kT2)