A source of light is placed above a sphere of radius `10cm`. How many photoelectrons must be emitted by the sphere before emission of photoelectrons stop? The energy of incident photon is `4.2eV` and the work function of the metal is `1.5eV`.

The energy of the incident photon is 20 eV and the work function of the photosensitive metal is 10 eV, the stopping potential is

What is the energy of emitted photoelectrons is light of frequency 10^(16) Hz is incident on a sodium target ? Work function of sodium is = 2.5 eV.

The energy of emitted photoelectrons from a metal is 0.9ev , The work function of the metal is 2.2eV . Then the energy of the incident photon is

Light of wavelength 4000A∘ is incident on a metal surface. The maximum kinetic energy of emitted photoelectron is 2 eV. What is the work function of the metal surface?

Light of wavelength 4000 Å is incident on a metal surface. The maximum kinetic energy of emitted photoelectron is 2 eV. What is the work function of the metal surface ?

The work function for a metal is 4eV. To emit a photoelectron of zero velocity from the surface of the metal, the wavelength of incident light should be :

The work function for a metal is 4eV. To emit a photoelectron of zero velocity from the surface of the metal, the wavelength of incident light should be :

The work function for a metal is 4eV. To emit a photoelectron of zero velocity from the surface of the metal, the wavelength of incident light should be :

The surface of a metal is illuminated alternately with photons of energies E_(1) = 4 eV and E_(2) = 2.5 eV respectively. The ratio of maximum speeds of the photoelectrons emitted in the two cases is 2. The work function of the metal in (eV) is ________.