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Q1. Determine the % change in thermionic emission for an oxide-coated filament of work function of 1.3eV if the temperature is decreased by 1.00% at a temperature of 2300K

I'm uncertain but i used

dJ/J=dT/T ( 2 + ((1160x1.3)/1000)

to get a 15% change in current density. I'm not really good at this so i not sure if i used the formula correctly

Q2. Calculate the % change in therimonic amission from tungsten filament of work function 4.52eV if the work funtion is decreased by 1.00% at a temperature of 2300K

I was really puzzled by this question as the difference is in this question the work function is said to decrease but i do not know how to calculate the % change.

Thanks in advance for all the help given.

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# Homework Help: Percent change in thermionic emission

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