Question

Which are the three main ways electrons can be emitted from a metal surface?

Options

• Photoelectric emission, positive ions, and potential difference

• Thermionic emission, work function, and electrical conduction

• Thermionic emission, field emission, and photoelectric emission

• Electrical conduction, field emission, and electron volt

Answer 1

The three methods are thermionic emission, field emission, and photoelectric emission. They differ in how energy or an applied field enables electrons to leave the metal.