10 photons each of energy 1.5 eV are made incident on a photosensitive plate whose work function is 3 eV. The number of electrons emitted from the plate will be

Two potons of energy 2.5eV each are incident on a metal plate whose work function is 4.0eV , then the number of emitted from the metal surface will be

Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV . The minimum kinetic energy of the emitted photo - electrons will be

Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV . The minimum kinetic energy of the emitted photo - electrons will be

Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV . The minimum kinetic energy of the emitted photo - electrons will be

Light of wavelength lambda = 400 nm is incident on a photosensitive metal whose work function is 2 eV. The maximum kinetic energy of photo electrons emitted will be

Photons of energy 4eV are incident on a metal sphere of work function 2eV .If the radius of the sphere is 5mm ,the number of electrons emitted before photo-electric emission stops is N times10^(6) .Then N =

Light of wavelength 4000 Å falls on a photosensitive plate with photoelectric work function 1.96 eV. The K.E. of photoelectrons emitted will be :

A photon of energy 4 eV is incident on a metal surface whose work function is 2 eV. The minimum reverse potential to be applied for stopping the emission of electrons is

A photon of energy 4 eV is incident on a metal surface whose work function is 2 eV . The minimum reverse potential to be applied for stopping the emission of electrons is