Which of the following when falls on a metal will emit photoelectrons ?

Work function of a metal is 2.1 eV . Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface ?

A metal emits photoelectrons when red light falls on it. Will this metal emit photoelectrons when blue light falls on it ? Why ?

When light of wavelength 6000oerset@A falls on a metal surface, photoelectrons are emitted from it with a velocity of 2 xx 10^5ms-1 .Calculate the work function of the metal in eV.

Ligth emitted during the de excitation of electrons from n=3 to n=2, when incident on metal, photoelectrons following de excitations photoelectrons are just emitted from that metal. In which of the following de excitations photoelectric effect, is not possible ?

Ligth emitted during the de excitation of electrons from n=3 to n=2, when incident on metal, photoelectrons following de excitations photoelectrons are just emitted from that metal. In which of the following de excitations photoelectric effect, is not possible ?

Photon of 5.5 eV energy fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0 eV . The stopping voltage required for these electrons are