Definitions [3]
Define the work function of a metal. Give its unit.
The minimum energy needed for an electron to escape from the metal surface is called the work function of that metal. Its unit is electron volt (eV).
Define the term: stopping potential in the photoelectric effect.
The stopping potential is defined as the potential necessary to stop any electron from reaching the other side.
Define the term: threshold frequency
Threshold frequency is the lowest frequency of electromagnetic radiation that will result in the emission of electrons from a specified metal surface.
Concepts [10]
- Dual Nature of Radiation
- Electric Discharge Through Gases
- Electron Emission
- Photoelectric Effect - Hertz’s Observations
- Photoelectric Effect - Hallwachs’ and Lenard’s Observations
- Experimental Study of Photoelectric Effect
- Einstein’s Photoelectric Equation: Energy Quantum of Radiation
- Particle Nature of Light: The Photon
- Wave Nature of Matter
- Davisson and Germer Experiment
