1) A metallic surface ejects electrons .when exposed to green light of intensity I but no photoelectrons are emitted when exposed to the yellow light of intensity I. It is possible to eject electrons from the same surface by A) yellow light of same intensity which is more than I B) green light of any intensity C) red light of any intensity D) none of above Answer: Option AExplanation:$\lambda_{red}$ > $\lambda_{violet}$ As wavelength, $\lambda$ less than that of yellow colour and hence can initiate photoelectric effect irrespective of intensity
