Question: Thomas refuses to believe that a potential difference can be created simply by bringing two different metals into contact with each other. John talks him

Thomas refuses to believe that a potential difference can be created simply by bringing two different metals into contact with each other. John talks him into making a small wager, and is about to cash in.

(a) Which two metals from Table 27-2 would demonstrate his point most effectively?

(b) What is the value of that contactpotential?

Work Functions for Some Metals g. eV Metal Silver Ag 4.7 Gold

Work Functions for Some Metals g. eV Metal Silver Ag 4.7 Gold 4.8 Au Ca Calcium 3.2 Copper Cu 4.1 Potassium 2.1 K Mn Manganese 3.8 Na Sodium 2.3 Ni Nickel 5.2

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