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Molecules and Crystals

Problem 6.205

The increase in temperature of a cathode in electronic tube by ΔT=1.0 K\Delta T=1.0 \mathrm{~K} from the value T=2000 KT=2000 \mathrm{~K} results in the increase of saturation current by η=1.4%\eta=1.4 \%. Find the work function of electron for the material of the cathode.

Reveal Answer
A=kT(ηT/ΔT−2)=4.5eVA=k T(\eta T / \Delta T-2)=4.5 \mathrm{eV}
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