Find the difference of kinetic energies of photoelectrons emitted from a surface by light of wavelength 2500Å and 5000Å. `h=6.62xx10^(-34)Js`.

The kinetic energies of the photoelectrons ejected from a metal surface by light of wavelength 2000 Å range from zero to 3.2 xx 10^(-19) Joule. Then find the stopping potential (in V).

The kinetic energies of the photoelectrons ejected from a metal surface by light of wavelength 2000 Å range from zero to 3.2 xx 10^(-19) Joule. Then find the stopping potential (in V).

The threshold wavelenght of silver is 3800 Å . Calculate the maximum kinetic energy in eV of photoelelctrons emitted, when ultraviolet light of wavelegth 2600 Å falls on it. ( Planck's constant, h=6*63xx10^(-34)"Js",. Velocity of light in air, c=3xx10^(8)m//s )

Work function of a metal surface is 2eV. Maximum kinetic energy of photoelectrons emitted from the surface for incidence of light of wavelength 4140 Å is 1eV. What is the threshold wavelength of radiation for that surface?

Find the number of emitted per minute by a 25W source of monochromatic light of wavelength 5000Å. Use h=6.63xx10^(-34)Js .