When radiation of suitable frequency is incident on a metal surface, electrons are emitted from the surface. This phenomenon is called photoelectric effect. Einstein explained this phenomenon considering the particle nature of radiation and using the law of conservation of energy. Wave theory of light could not explain this phenomenon. (i) (a) A photon of $3\cdot8\text{ eV}$ energy is incident on a surface of work function $1\cdot8\text{ eV}$. The maximum kinetic energy of the electron emitted from the surface will be : (A) $3\cdot2 \times 10^{-19}\text{ J}$ (B) $1\cdot6 \times 10^{-19}\text{ J}$ (C) $1\cdot25 \times 10^{-19}\text{ J}$ (D) $2\cdot4 \times 10^{-18}\text{ J}$ OR