A metallic surface with work function of 2 eV, on heating to a temperature of 800 K gives an emission current of 1 mA. If another metallic surface having the same surface area, same emission constant but work function 4 eV is heated to a temperature of 1600 K, then the emission current will be
Text Solution
Verified by ExpertsThe correct answer is:
C
The emission current 
For the two surfaces 
Therefore, 
.
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