Blue light can eject electrons from a photo sensitive surface while orange light can not. Will violet and red light eject electrons from the metal surface?

Green light ejects electrons from a certain photosensitive surface, yellow light does not. Will red and violet light eject electrons from the same surface?

Green light ejects electrons from a certain photosensitive surface, yellow light does not. Will red and violet light eject electrons from the same surface? Give reasons.

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: Kinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon. Reason: The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.

Explain two ways of emission of electrons from metal surfaces.

Work function of a metl surface is 4.2 eV. The maximum wavelength which can eject electrons from this metal surface is: