52) Threshold frequency of a photon required to eject a photoelectron from the surface of cesium is

53) If work function of a metal plate is negligible then the K.E.of the photoelectrons emitted when radiations of 1000?A⁰?are incident on the metal surface is

54) Maximum velocity of photoelectrons emitted from a metal surface having work function 4 eV is

55) When ultraviolet light of wavelength 1000?A⁰?is incident on molybdenum, then the maximum velocity of ejected electron (given: work function of molybdenum = 5.0eV) is

56) If threshold wavelength for tungsten is 2300?A⁰, then energy of the electrons emitted by UV light of wavelength 1800?A⁰?is