Question

In which is thermionic work function measured? How is it related is it related to the S.I. unit of this quantity?

• A. kWh ; 1kWh = 3.6 x 10⁶ J
• B. eV ; 1 eV = 1.6 x 10¹⁹J
• C. Wh ; 1 Wh = 3.6 x 10³ J
• D. Calories ; 1 Cal = 4.2 J

Answer 1

The correct option is B

eV ; 1 eV = 1.6 x 10¹⁹J

Electron-volt measures work function / threshold energy. 1eV = 1.6 × 10^-19J