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

57) If maximum velocity with which an electron can be emitted from a photo cell is 3.75?10⁸cms^?1, then stopping potential is

58) Wavelength of light incident on a photo cell is 3000?A⁰, if stopping potential is 2.5 volts, then work function of the cathode of photo cell is