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).

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 photoelectrons range from zero to 4.0xx10^(-19)J when light of wavelength 3000 Å falls on a surface. What is the stopping potential for this light?

Maximum kinetic energy of photoelectrons emitted from a metal surface, when light of wavelength lambda is incident on it, is 1 eV. When a light of wavelength lambda/3 is incident on the surfaces, maximum kinetic energy becomes 4 times. The work function of the metal is

Find the (a) maximum kinetic energy of photoelectrons ejected from potassium surface, for which , phi=2.1 eV , by photons of wavelengths 2000 Å and 5000 Å. (b) What is the threshold frequency v_(0) and (c) the corresponding wavelength?

a. A stopping potential of 0.82V is required to stop the emission of photoelectrons from the surface of a metal by light of eavelength 4000 A . For light of wavelength 3000 A , the stopping potential is 1.85V . Find the value of Planck's constant. [1 electrons volt (eV) =1.6xx10^(-19)J] b. At stopping potential, if the wavelength of the incident light is kept fixed at 4000 A , but the intensity of light increases two times, will photoelectric current be botained ? Give reasons for your answer.

Light of wavelength 2000 Å falls on a metallic surface whose work function is 4.21 eV. Calculate the stopping potential

Find the maximum kinetic energy of the photoelectrons ejected when light of wavelength 350mn is incident on a cesium surface. Work function of cesium = 1.9 e V.

In a photoelectric experiment the wavelength of incident light changes from 4000 Å to 2000 Å. The change in stopping potential is

Calculate the value of retarding potential in volt needed to stop the photoelectron ejected from a metal surface of work function 1.29 eV with light frequency of 5.5 xx 10^(14) sec^(-1) (nearly)