Dual nature of radiation and matter ( photoelectric effect)
1. Define work function of a metal? The minimum energy required for an electron to escape from the metal surface is called the work function of the metal 2. Define 1eV 1eV is the energy gained by an electron when it is accelerated through a potential difference of one volt. 3. Define thermionic emission? Emission of electron from a metal surface when it is heated to sufficiently high temperature is called thermionic emission. 4. Define field emission? Emission of electron from metal surface when it is subjected to high electric field (of the order of 10 8 v) is called field emission. 5. Define photoelectric emission? Emission of electrons from metal surface, when it is illuminated with light of suitable frequency is called photoelectric effect. 6. Who discovered photoelectric effect? Henrich Hertz discovered photoelectric effect. 7. Define threshold frequency of a metal? Threshold frequency of a metal is the minimum cut-off frequency of incident light below which n...