• # question_answer When light of intensity ${{I}_{1}}$ & frequency ${{v}_{1}}$ is incident on a substance. Photo electric emission take place and variation potential (V) is as shown by curve (1) in the figure. However, if light of intensity ${{I}_{2}}$ & frequency ${{v}_{2}}$ falls on the same substance, photo electric current varies with potential as shown by curve (2) which of the following is correct - A) ${{I}_{1}}={{I}_{2}},$ ${{v}_{1}}={{v}_{2}}$       B) ${{I}_{1}}>{{I}_{2}},$ ${{v}_{1}}>{{v}_{2}}$ C) ${{I}_{1}},>{{I}_{2}},$ ${{v}_{1}}<{{v}_{2}}$      D) ${{I}_{1}},<{{I}_{2}},$ ${{v}_{1}}<{{v}_{2}}$

[C] Photo current $\propto$ intensity $\therefore \,\,\,{{I}_{1}}>{{I}_{2}}$ Higher the frequency of light higher then stopping potential $\therefore \,\,\,{{v}_{2}}>{{v}_{1}}$