A photon of energy `2.5 eV` and wavelenght `lambda` falls on a metal surface and the ejected electron have velocity `'v'`. If the `lambda` of the incident light is decreased by `20%` the maximum velocity of the emitted electrons is doubled. The work function of the metal is

A photon of energy 2.5 eV and wavelength ′ λ ′ falls on a metal surface and the ejected electrons have maximum velocity ′ v ′ . If the ′ λ ′ of the incident light is decreased by 20%, the maximum velocity of the emitted electrons is doubled. The work function of the metal is :

Photon of energy 2.0 eV and wavelength lamda fall on a metal plate and release photoelectrons with a maximum velocity v. By decreasing lamda by25% the maximum velocity of photoelectrons is doubled .The work function of the material of the metal plate in eV is

Photons of energy 2.0eV fall on a metal plate and release photoelectrons with a maximum velocity V . By decreasing lambda and 25% the maximum velocity of photoelectrons is doubled. The work function of the metal of the material plate in eV is nearly

When light of energy 2.5 eV falls on a metal surface, the maximum K.E. of the emitted electrons is T. If the radiation of energy 4eV is made incident on the same metal surface, the K.E. of the electrons is doubled. What is the work function of the metal ?

When light of 2.5 eV falls on a metal surface, maximum kinetic energy of electron is T. If incident radiation of 4 eV falls on same metal surface, maximum kinetic energy of electrons is doubled. The work function of metal is

When light of 2.5 eV falls on a metal surface, maximum kinetic energy of electron is T. If incident radiation of 4 eV falls on same metal surface, maximum kinetic energy of electrons is doubled. The work function of metal is