Question

Which simple excitations can change the number of mobile charges in a semiconductor?

Options

• Light, heat, or small applied voltage

• A metal point contact, anode, or cathode

• Light, air molecules, or a large evacuated space

• A heated cathode, plate, or grid

Answer 1

Light, heat, or a small applied voltage can change the number of mobile charges. Each is a simple excitation that affects charge carriers in a semiconductor.